77081280 has 112 divisors (see below), whose sum is σ = 255446784. Its totient is φ = 19655680.

The previous prime is 77081273. The next prime is 77081299. The reversal of 77081280 is 8218077.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20335 + ... + 23825.

Almost surely, 2^77081280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77081280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127723392).

77081280 is an abundant number, since it is smaller than the sum of its proper divisors (178365504).

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

77081280 is a wasteful number, since it uses less digits than its factorization.

77081280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3534 (or 3524 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 77081280 is about 8779.5945236668. The cubic root of 77081280 is about 425.5817270312.

The spelling of 77081280 in words is "seventy-seven million, eighty-one thousand, two hundred eighty".