77987572 has 48 divisors (see below), whose sum is σ = 154611072. Its totient is φ = 34151040.

The previous prime is 77987561. The next prime is 77987573. The reversal of 77987572 is 27578977.

It is a super-2 number, since 2×77987572² = 12164122772910368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77987573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235447 + ... + 235777.

It is an arithmetic number, because the mean of its divisors is an integer number (3221064).

Almost surely, 2^77987572 is an apocalyptic number.

It is an amenable number.

77987572 is a deficient number, since it is larger than the sum of its proper divisors (76623500).

77987572 is a wasteful number, since it uses less digits than its factorization.

77987572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568 (or 566 counting only the distinct ones).

The product of its digits is 1728720, while the sum is 52.

The square root of 77987572 is about 8831.0572413500. The cubic root of 77987572 is about 427.2431743995.

The spelling of 77987572 in words is "seventy-seven million, nine hundred eighty-seven thousand, five hundred seventy-two".