77328957 has 4 divisors (see below), whose sum is σ = 103105280. Its totient is φ = 51552636.

The previous prime is 77328943. The next prime is 77328997. The reversal of 77328957 is 75982377.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75982377 = 3 ⋅25327459.

It is not a de Polignac number, because 77328957 - 2⁶ = 77328893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77328997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12888157 + ... + 12888162.

It is an arithmetic number, because the mean of its divisors is an integer number (25776320).

Almost surely, 2^77328957 is an apocalyptic number.

It is an amenable number.

77328957 is a deficient number, since it is larger than the sum of its proper divisors (25776323).

77328957 is a wasteful number, since it uses less digits than its factorization.

77328957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25776322.

The product of its digits is 740880, while the sum is 48.

The square root of 77328957 is about 8793.6884752645. The cubic root of 77328957 is about 426.0370650375.

The spelling of 77328957 in words is "seventy-seven million, three hundred twenty-eight thousand, nine hundred fifty-seven".