77144920 has 16 divisors (see below), whose sum is σ = 173576160. Its totient is φ = 30857952.

The previous prime is 77144917. The next prime is 77144941. The reversal of 77144920 is 2944177.

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 3 ways as a sum of consecutive naturals, for example, 964272 + ... + 964351.

It is an arithmetic number, because the mean of its divisors is an integer number (10848510).

Almost surely, 2^77144920 is an apocalyptic number.

It is an amenable number.

77144920 is an abundant number, since it is smaller than the sum of its proper divisors (96431240).

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

77144920 is a wasteful number, since it uses less digits than its factorization.

77144920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928634 (or 1928630 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 77144920 is about 8783.2180890605. The cubic root of 77144920 is about 425.6988180240.

The spelling of 77144920 in words is "seventy-seven million, one hundred forty-four thousand, nine hundred twenty".