77912140 has 24 divisors (see below), whose sum is σ = 163783872. Its totient is φ = 31132800.

The previous prime is 77912137. The next prime is 77912143. The reversal of 77912140 is 4121977.

It is an interprime number because it is at equal distance from previous prime (77912137) and next prime (77912143).

It is not an unprimeable number, because it can be changed into a prime (77912143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31965 + ... + 34315.

It is an arithmetic number, because the mean of its divisors is an integer number (6824328).

Almost surely, 2^77912140 is an apocalyptic number.

It is an amenable number.

77912140 is an abundant number, since it is smaller than the sum of its proper divisors (85871732).

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

77912140 is a wasteful number, since it uses less digits than its factorization.

77912140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4017 (or 4015 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 77912140 is about 8826.7853718101. The cubic root of 77912140 is about 427.1053823450.

The spelling of 77912140 in words is "seventy-seven million, nine hundred twelve thousand, one hundred forty".