77809490 has 16 divisors (see below), whose sum is σ = 152789760. Its totient is φ = 28294320.

The previous prime is 77809469. The next prime is 77809553. The reversal of 77809490 is 9490877.

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, 353570 + ... + 353789.

It is an arithmetic number, because the mean of its divisors is an integer number (9549360).

Almost surely, 2^77809490 is an apocalyptic number.

77809490 is a deficient number, since it is larger than the sum of its proper divisors (74980270).

77809490 is a wasteful number, since it uses less digits than its factorization.

77809490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707377.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 77809490 is about 8820.9687676581. The cubic root of 77809490 is about 426.9177280811.

The spelling of 77809490 in words is "seventy-seven million, eight hundred nine thousand, four hundred ninety".