64723536 has 140 divisors (see below), whose sum is σ = 195166080. Its totient is φ = 20761920.

The previous prime is 64723523. The next prime is 64723537. The reversal of 64723536 is 63532746.

64723536 is a `hidden beast` number, since 647 + 2 + 3 + 5 + 3 + 6 = 666.

It is a super-2 number, since 2×64723536² = 8378272224686592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 64723536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64723537) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 361495 + ... + 361673.

Almost surely, 2^64723536 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 64723536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97583040).

64723536 is an abundant number, since it is smaller than the sum of its proper divisors (130442544).

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

64723536 is a wasteful number, since it uses less digits than its factorization.

64723536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 215 counting only the distinct ones).

The product of its digits is 90720, while the sum is 36.

The square root of 64723536 is about 8045.0939087123. The cubic root of 64723536 is about 401.5017216911.

The spelling of 64723536 in words is "sixty-four million, seven hundred twenty-three thousand, five hundred thirty-six".