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66990313 = 1337139273
BaseRepresentation
bin1111111110001…
…1000011101001
311200001110102201
43333203003221
5114122142223
610351500201
71442260015
oct377430351
9150043381
1066990313
11348a58a5
121a527661
1310b56950
148c7b545
155d33ead
hex3fe30e9

66990313 has 8 divisors (see below), whose sum is σ = 74093768. Its totient is φ = 60165504.

The previous prime is 66990307. The next prime is 66990331. The reversal of 66990313 is 31309966.

66990313 = 57872 + 57882.

It can be written as a sum of positive squares in 4 ways, for example, as 33500944 + 33489369 = 5788^2 + 5787^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66990313 - 25 = 66990281 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66990373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69156 + ... + 70117.

It is an arithmetic number, because the mean of its divisors is an integer number (9261721).

Almost surely, 266990313 is an apocalyptic number.

66990313 is the 5788-th centered square number.

It is an amenable number.

66990313 is a deficient number, since it is larger than the sum of its proper divisors (7103455).

66990313 is a wasteful number, since it uses less digits than its factorization.

66990313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139323.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 66990313 is about 8184.7610227789. The cubic root of 66990313 is about 406.1352348641.

The spelling of 66990313 in words is "sixty-six million, nine hundred ninety thousand, three hundred thirteen".

Divisors: 1 13 37 481 139273 1810549 5153101 66990313