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80661993 = 3117122961
BaseRepresentation
bin1001100111011…
…00110111101001
312121210001110020
410303230313221
5131122140433
612000511053
71666421106
oct463546751
9177701406
1080661993
1141593605
122301b489
13139327b9
14a9d9aad
157134cb3
hex4cecde9

80661993 has 8 divisors (see below), whose sum is σ = 107645856. Its totient is φ = 53726400.

The previous prime is 80661983. The next prime is 80662003. The reversal of 80661993 is 39916608.

It is an interprime number because it is at equal distance from previous prime (80661983) and next prime (80662003).

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

It is not a de Polignac number, because 80661993 - 26 = 80661929 is a prime.

It is a super-2 number, since 2×806619932 = 13012714229464098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80661913) 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, 7968 + ... + 14993.

It is an arithmetic number, because the mean of its divisors is an integer number (13455732).

Almost surely, 280661993 is an apocalyptic number.

It is an amenable number.

80661993 is a deficient number, since it is larger than the sum of its proper divisors (26983863).

80661993 is a wasteful number, since it uses less digits than its factorization.

80661993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24135.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 80661993 is about 8981.2022023780. The cubic root of 80661993 is about 432.0721919390.

The spelling of 80661993 in words is "eighty million, six hundred sixty-one thousand, nine hundred ninety-three".

Divisors: 1 3 1171 3513 22961 68883 26887331 80661993