77694945 has 16 divisors (see below), whose sum is σ = 126064512. Its totient is φ = 40853120.

The previous prime is 77694941. The next prime is 77694949. The reversal of 77694945 is 54949677.

It is an interprime number because it is at equal distance from previous prime (77694941) and next prime (77694949).

It is not a de Polignac number, because 77694945 - 2² = 77694941 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77694941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35412 + ... + 37541.

It is an arithmetic number, because the mean of its divisors is an integer number (7879032).

Almost surely, 2^77694945 is an apocalyptic number.

It is an amenable number.

77694945 is a deficient number, since it is larger than the sum of its proper divisors (48369567).

77694945 is a wasteful number, since it uses less digits than its factorization.

77694945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73032.

The product of its digits is 1905120, while the sum is 51.

The square root of 77694945 is about 8814.4736087869. The cubic root of 77694945 is about 426.7081336515.

The spelling of 77694945 in words is "seventy-seven million, six hundred ninety-four thousand, nine hundred forty-five".