77557997 has 8 divisors (see below), whose sum is σ = 84732960. Its totient is φ = 70403760.

The previous prime is 77557993. The next prime is 77558003. The reversal of 77557997 is 79975577.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77557997 - 2² = 77557993 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 (77557993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3254 + ... + 12872.

It is an arithmetic number, because the mean of its divisors is an integer number (10591620).

Almost surely, 2^77557997 is an apocalyptic number.

It is an amenable number.

77557997 is a deficient number, since it is larger than the sum of its proper divisors (7174963).

77557997 is a wasteful number, since it uses less digits than its factorization.

77557997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10363.

The product of its digits is 4862025, while the sum is 56.

The square root of 77557997 is about 8806.7018230436. The cubic root of 77557997 is about 426.4572756604.

The spelling of 77557997 in words is "seventy-seven million, five hundred fifty-seven thousand, nine hundred ninety-seven".