77212140 has 48 divisors (see below), whose sum is σ = 219432192. Its totient is φ = 20281536.

The previous prime is 77212139. The next prime is 77212141. The reversal of 77212140 is 4121277.

It is an interprime number because it is at equal distance from previous prime (77212139) and next prime (77212141).

It is a self number, because there is not a number n which added to its sum of digits gives 77212140.

It is not an unprimeable number, because it can be changed into a prime (77212141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5584 + ... + 13623.

It is an arithmetic number, because the mean of its divisors is an integer number (4571504).

Almost surely, 2^77212140 is an apocalyptic number.

It is an amenable number.

77212140 is an abundant number, since it is smaller than the sum of its proper divisors (142220052).

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

77212140 is a wasteful number, since it uses less digits than its factorization.

77212140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19286 (or 19284 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 77212140 is about 8787.0438715190. The cubic root of 77212140 is about 425.8224259351.

The spelling of 77212140 in words is "seventy-seven million, two hundred twelve thousand, one hundred forty".