77929140 has 24 divisors (see below), whose sum is σ = 218201760. Its totient is φ = 20781088.

The previous prime is 77929123. The next prime is 77929153. The reversal of 77929140 is 4192977.

It is a super-2 number, since 2×77929140² = 12145901722279200, which contains 22 as substring.

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, 649350 + ... + 649469.

It is an arithmetic number, because the mean of its divisors is an integer number (9091740).

Almost surely, 2^77929140 is an apocalyptic number.

It is an amenable number.

77929140 is an abundant number, since it is smaller than the sum of its proper divisors (140272620).

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

77929140 is a wasteful number, since it uses less digits than its factorization.

77929140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298831 (or 1298829 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 77929140 is about 8827.7482972726. The cubic root of 77929140 is about 427.1364441003.

The spelling of 77929140 in words is "seventy-seven million, nine hundred twenty-nine thousand, one hundred forty".