66990500 has 24 divisors (see below), whose sum is σ = 146308344. Its totient is φ = 26796000.

The previous prime is 66990491. The next prime is 66990503. The reversal of 66990500 is 509966.

It can be written as a sum of positive squares in 4 ways, for example, as 1833316 + 65157184 = 1354^2 + 8072^2 .

It is not an unprimeable number, because it can be changed into a prime (66990503) 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, 66491 + ... + 67490.

It is an arithmetic number, because the mean of its divisors is an integer number (6096181).

Almost surely, 2^66990500 is an apocalyptic number.

It is an amenable number.

66990500 is an abundant number, since it is smaller than the sum of its proper divisors (79317844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66990500 is a wasteful number, since it uses less digits than its factorization.

66990500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134000 (or 133988 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 66990500 is about 8184.7724464398. The cubic root of 66990500 is about 406.1356127656.

The spelling of 66990500 in words is "sixty-six million, nine hundred ninety thousand, five hundred".