77139036 has 108 divisors (see below), whose sum is σ = 218487360. Its totient is φ = 22913280.

The previous prime is 77138983. The next prime is 77139061. The reversal of 77139036 is 63093177.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 35 ways as a sum of consecutive naturals, for example, 188400 + ... + 188808.

Almost surely, 2^77139036 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 77139036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109243680).

77139036 is an abundant number, since it is smaller than the sum of its proper divisors (141348324).

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

77139036 is a wasteful number, since it uses less digits than its factorization.

77139036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 23814, while the sum is 36.

The square root of 77139036 is about 8782.8831257167. The cubic root of 77139036 is about 425.6879947772.

The spelling of 77139036 in words is "seventy-seven million, one hundred thirty-nine thousand, thirty-six".