77928697 has 32 divisors (see below), whose sum is σ = 105719040. Its totient is φ = 55572480.

The previous prime is 77928661. The next prime is 77928701. The reversal of 77928697 is 79682977.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77928697 is a prime.

It is a super-2 number, since 2×77928697² = 12145763632235618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77928607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47629 + ... + 49237.

It is an arithmetic number, because the mean of its divisors is an integer number (3303720).

Almost surely, 2^77928697 is an apocalyptic number.

77928697 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

77928697 is a deficient number, since it is larger than the sum of its proper divisors (27790343).

77928697 is a wasteful number, since it uses less digits than its factorization.

77928697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681.

The product of its digits is 2667168, while the sum is 55.

The square root of 77928697 is about 8827.7232059008. The cubic root of 77928697 is about 427.1356347248.

The spelling of 77928697 in words is "seventy-seven million, nine hundred twenty-eight thousand, six hundred ninety-seven".