77406957 has 12 divisors (see below), whose sum is σ = 111890844. Its totient is φ = 51567360.

The previous prime is 77406943. The next prime is 77406961. The reversal of 77406957 is 75960477.

It can be written as a sum of positive squares in 2 ways, for example, as 43639236 + 33767721 = 6606^2 + 5811^2 .

It is not a de Polignac number, because 77406957 - 2⁴ = 77406941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77406157) 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, 16663 + ... + 20795.

It is an arithmetic number, because the mean of its divisors is an integer number (9324237).

Almost surely, 2^77406957 is an apocalyptic number.

It is an amenable number.

77406957 is a deficient number, since it is larger than the sum of its proper divisors (34483887).

77406957 is a wasteful number, since it uses less digits than its factorization.

77406957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6220 (or 6217 counting only the distinct ones).

The product of its (nonzero) digits is 370440, while the sum is 45.

The square root of 77406957 is about 8798.1223565031. The cubic root of 77406957 is about 426.1802616076.

The spelling of 77406957 in words is "seventy-seven million, four hundred six thousand, nine hundred fifty-seven".