77461638 has 16 divisors (see below), whose sum is σ = 155012400. Its totient is φ = 25805696.

The previous prime is 77461621. The next prime is 77461649. The reversal of 77461638 is 83616477.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77461638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14338 + ... + 18986.

It is an arithmetic number, because the mean of its divisors is an integer number (9688275).

Almost surely, 2^77461638 is an apocalyptic number.

77461638 is an abundant number, since it is smaller than the sum of its proper divisors (77550762).

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

77461638 is a wasteful number, since it uses less digits than its factorization.

77461638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7431.

The product of its digits is 169344, while the sum is 42.

The square root of 77461638 is about 8801.2293459493. The cubic root of 77461638 is about 426.2805905641.

The spelling of 77461638 in words is "seventy-seven million, four hundred sixty-one thousand, six hundred thirty-eight".