77979387 has 8 divisors (see below), whose sum is σ = 106782736. Its totient is φ = 50581152.

The previous prime is 77979383. The next prime is 77979389. The reversal of 77979387 is 78397977.

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

It is not a de Polignac number, because 77979387 - 2² = 77979383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77979383) 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, 351148 + ... + 351369.

It is an arithmetic number, because the mean of its divisors is an integer number (13347842).

Almost surely, 2^77979387 is an apocalyptic number.

77979387 is a deficient number, since it is larger than the sum of its proper divisors (28803349).

77979387 is a wasteful number, since it uses less digits than its factorization.

77979387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702557.

The product of its digits is 4667544, while the sum is 57.

The square root of 77979387 is about 8830.5938078931. The cubic root of 77979387 is about 427.2282271130.

The spelling of 77979387 in words is "seventy-seven million, nine hundred seventy-nine thousand, three hundred eighty-seven".