77278990 has 16 divisors (see below), whose sum is σ = 139209840. Its totient is φ = 30887680.

The previous prime is 77278969. The next prime is 77279021. The reversal of 77278990 is 9987277.

It is a congruent number.

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, 16845 + ... + 20935.

It is an arithmetic number, because the mean of its divisors is an integer number (8700615).

Almost surely, 2^77278990 is an apocalyptic number.

77278990 is a deficient number, since it is larger than the sum of its proper divisors (61930850).

77278990 is a wasteful number, since it uses less digits than its factorization.

77278990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5987.

The product of its (nonzero) digits is 444528, while the sum is 49.

The square root of 77278990 is about 8790.8469444076. The cubic root of 77278990 is about 425.9452823400.

The spelling of 77278990 in words is "seventy-seven million, two hundred seventy-eight thousand, nine hundred ninety".