77687945 has 8 divisors (see below), whose sum is σ = 95209344. Its totient is φ = 60827824.

The previous prime is 77687933. The next prime is 77687957. The reversal of 77687945 is 54978677.

It is an interprime number because it is at equal distance from previous prime (77687933) and next prime (77687957).

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 77687945 - 2⁶ = 77687881 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165059 + ... + 165528.

It is an arithmetic number, because the mean of its divisors is an integer number (11901168).

Almost surely, 2^77687945 is an apocalyptic number.

It is an amenable number.

77687945 is a deficient number, since it is larger than the sum of its proper divisors (17521399).

77687945 is a wasteful number, since it uses less digits than its factorization.

77687945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330639.

The product of its digits is 2963520, while the sum is 53.

The square root of 77687945 is about 8814.0765256492. The cubic root of 77687945 is about 426.6953183749.

The spelling of 77687945 in words is "seventy-seven million, six hundred eighty-seven thousand, nine hundred forty-five".