77438975 has 12 divisors (see below), whose sum is σ = 97653720. Its totient is φ = 60900000.

The previous prime is 77438971. The next prime is 77438981. The reversal of 77438975 is 57983477.

It is not a de Polignac number, because 77438975 - 2² = 77438971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77438971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24776 + ... + 27725.

It is an arithmetic number, because the mean of its divisors is an integer number (8137810).

Almost surely, 2^77438975 is an apocalyptic number.

77438975 is a deficient number, since it is larger than the sum of its proper divisors (20214745).

77438975 is a wasteful number, since it uses less digits than its factorization.

77438975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52570 (or 52565 counting only the distinct ones).

The product of its digits is 1481760, while the sum is 50.

The square root of 77438975 is about 8799.9417611709. The cubic root of 77438975 is about 426.2390141159.

The spelling of 77438975 in words is "seventy-seven million, four hundred thirty-eight thousand, nine hundred seventy-five".