77378816 has 18 divisors (see below), whose sum is σ = 154455882. Its totient is φ = 38689280.

The previous prime is 77378813. The next prime is 77378839. The reversal of 77378816 is 61887377.

It can be written as a sum of positive squares in only one way, i.e., 65545216 + 11833600 = 8096^2 + 3440^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77378813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 150875 + ... + 151386.

Almost surely, 2^77378816 is an apocalyptic number.

It is an amenable number.

77378816 is a deficient number, since it is larger than the sum of its proper divisors (77077066).

77378816 is an equidigital number, since it uses as much as digits as its factorization.

77378816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302277 (or 302263 counting only the distinct ones).

The product of its digits is 395136, while the sum is 47.

The square root of 77378816 is about 8796.5229494386. The cubic root of 77378816 is about 426.1286099523.

The spelling of 77378816 in words is "seventy-seven million, three hundred seventy-eight thousand, eight hundred sixteen".