77922421 has 8 divisors (see below), whose sum is σ = 79388640. Its totient is φ = 76461168.

The previous prime is 77922389. The next prime is 77922431. The reversal of 77922421 is 12422977.

It is a happy number.

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

It is not a de Polignac number, because 77922421 - 2⁵ = 77922389 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 (77922431) 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, 47995 + ... + 49591.

It is an arithmetic number, because the mean of its divisors is an integer number (9923580).

Almost surely, 2^77922421 is an apocalyptic number.

It is an amenable number.

77922421 is a deficient number, since it is larger than the sum of its proper divisors (1466219).

77922421 is a wasteful number, since it uses less digits than its factorization.

77922421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2483.

The product of its digits is 14112, while the sum is 34.

The square root of 77922421 is about 8827.3677276978. The cubic root of 77922421 is about 427.1241679383.

The spelling of 77922421 in words is "seventy-seven million, nine hundred twenty-two thousand, four hundred twenty-one".