77712420 has 24 divisors (see below), whose sum is σ = 217594944. Its totient is φ = 20723296.

The previous prime is 77712419. The next prime is 77712433. The reversal of 77712420 is 2421777.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 647544 + ... + 647663.

It is an arithmetic number, because the mean of its divisors is an integer number (9066456).

Almost surely, 2^77712420 is an apocalyptic number.

It is an amenable number.

77712420 is an abundant number, since it is smaller than the sum of its proper divisors (139882524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77712420 is a wasteful number, since it uses less digits than its factorization.

77712420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295219 (or 1295217 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 30.

The square root of 77712420 is about 8815.4648204164. The cubic root of 77712420 is about 426.7401227153.

The spelling of 77712420 in words is "seventy-seven million, seven hundred twelve thousand, four hundred twenty".