77390440 has 16 divisors (see below), whose sum is σ = 174128580. Its totient is φ = 30956160.

The previous prime is 77390437. The next prime is 77390447. The reversal of 77390440 is 4409377.

It can be written as a sum of positive squares in 2 ways, for example, as 76772644 + 617796 = 8762^2 + 786^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77390396 and 77390405.

It is not an unprimeable number, because it can be changed into a prime (77390447) 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, 967341 + ... + 967420.

Almost surely, 2^77390440 is an apocalyptic number.

It is an amenable number.

77390440 is an abundant number, since it is smaller than the sum of its proper divisors (96738140).

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

77390440 is a wasteful number, since it uses less digits than its factorization.

77390440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934772 (or 1934768 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 77390440 is about 8797.1836402340. The cubic root of 77390440 is about 426.1499468470.

The spelling of 77390440 in words is "seventy-seven million, three hundred ninety thousand, four hundred forty".