77489536 has 64 divisors (see below), whose sum is σ = 165240000. Its totient is φ = 36069376.

The previous prime is 77489521. The next prime is 77489557. The reversal of 77489536 is 63598477.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 77489536.

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 7 ways as a sum of consecutive naturals, for example, 324105 + ... + 324343.

It is an arithmetic number, because the mean of its divisors is an integer number (2581875).

Almost surely, 2^77489536 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 77489536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82620000).

77489536 is an abundant number, since it is smaller than the sum of its proper divisors (87750464).

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

77489536 is a wasteful number, since it uses less digits than its factorization.

77489536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419 (or 407 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 49.

The square root of 77489536 is about 8802.8140955038. The cubic root of 77489536 is about 426.3317597570.

The spelling of 77489536 in words is "seventy-seven million, four hundred eighty-nine thousand, five hundred thirty-six".