77428816 has 20 divisors (see below), whose sum is σ = 150160032. Its totient is φ = 38677856.

The previous prime is 77428807. The next prime is 77428817. The reversal of 77428816 is 61882477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77428817) 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, 25221 + ... + 28123.

Almost surely, 2^77428816 is an apocalyptic number.

It is an amenable number.

77428816 is a deficient number, since it is larger than the sum of its proper divisors (72731216).

77428816 is a wasteful number, since it uses less digits than its factorization.

77428816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578 (or 4572 counting only the distinct ones).

The product of its digits is 150528, while the sum is 43.

The square root of 77428816 is about 8799.3645225096. The cubic root of 77428816 is about 426.2203742707.

The spelling of 77428816 in words is "seventy-seven million, four hundred twenty-eight thousand, eight hundred sixteen".