77940612 has 18 divisors (see below), whose sum is σ = 197016638. Its totient is φ = 25980192.

The previous prime is 77940607. The next prime is 77940659. The reversal of 77940612 is 21604977.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 77686596 + 254016 = 8814^2 + 504^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2165017 = 77940612 / (7 + 7 + 9 + 4 + 0 + 6 + 1 + 2).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1082473 + ... + 1082544.

Almost surely, 2^77940612 is an apocalyptic number.

It is an amenable number.

77940612 is an abundant number, since it is smaller than the sum of its proper divisors (119076026).

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

77940612 is a wasteful number, since it uses less digits than its factorization.

77940612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165027 (or 2165022 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 77940612 is about 8828.3980426802. The cubic root of 77940612 is about 427.1574027509.

The spelling of 77940612 in words is "seventy-seven million, nine hundred forty thousand, six hundred twelve".