77974620 has 96 divisors (see below), whose sum is σ = 231577920. Its totient is φ = 19568640.

The previous prime is 77974583. The next prime is 77974679. The reversal of 77974620 is 2647977.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 70794 + ... + 71886.

It is an arithmetic number, because the mean of its divisors is an integer number (2412270).

Almost surely, 2^77974620 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 77974620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115788960).

77974620 is an abundant number, since it is smaller than the sum of its proper divisors (153603300).

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

77974620 is a wasteful number, since it uses less digits than its factorization.

77974620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175 (or 1173 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 42.

The square root of 77974620 is about 8830.3238898695. The cubic root of 77974620 is about 427.2195212292.

The spelling of 77974620 in words is "seventy-seven million, nine hundred seventy-four thousand, six hundred twenty".