64621536 has 192 divisors, whose sum is σ = 209599488. Its totient is φ = 17031168.

The previous prime is 64621523. The next prime is 64621549. The reversal of 64621536 is 63512646.

64621536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (64621523) and next prime (64621549).

It is a junction number, because it is equal to n+sod(n) for n = 64621497 and 64621506.

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, 571816 + ... + 571928.

It is an arithmetic number, because the mean of its divisors is an integer number (1091664).

Almost surely, 2^64621536 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 64621536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104799744).

64621536 is an abundant number, since it is smaller than the sum of its proper divisors (144977952).

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

64621536 is a wasteful number, since it uses less digits than its factorization.

64621536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 185 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 64621536 is about 8038.7521419683. The cubic root of 64621536 is about 401.2906974375.

The spelling of 64621536 in words is "sixty-four million, six hundred twenty-one thousand, five hundred thirty-six".