64537236 has 60 divisors (see below), whose sum is σ = 178652628. Its totient is φ = 20245248.

The previous prime is 64537229. The next prime is 64537261. The reversal of 64537236 is 63273546.

64537236 is a `hidden beast` number, since 645 + 3 + 7 + 2 + 3 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18974736 + 45562500 = 4356^2 + 6750^2 .

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 64537236.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 351 + ... + 11366.

Almost surely, 2^64537236 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 64537236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89326314).

64537236 is an abundant number, since it is smaller than the sum of its proper divisors (114115392).

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

64537236 is a wasteful number, since it uses less digits than its factorization.

64537236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11750 (or 11739 counting only the distinct ones).

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

The square root of 64537236 is about 8033.5070797255. The cubic root of 64537236 is about 401.1161244356.

It can be divided in two parts, 6453 and 7236, that added together give a square (13689 = 117²).

The spelling of 64537236 in words is "sixty-four million, five hundred thirty-seven thousand, two hundred thirty-six".