64476636 has 72 divisors (see below), whose sum is σ = 179862144. Its totient is φ = 17608800.

The previous prime is 64476623. The next prime is 64476691. The reversal of 64476636 is 63667446.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43711 + ... + 45161.

Almost surely, 2^64476636 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 64476636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89931072).

64476636 is an abundant number, since it is smaller than the sum of its proper divisors (115385508).

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

64476636 is a wasteful number, since it uses less digits than its factorization.

64476636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511 (or 1486 counting only the distinct ones).

The product of its digits is 435456, while the sum is 42.

The square root of 64476636 is about 8029.7344912519. The cubic root of 64476636 is about 400.9905367344.

The spelling of 64476636 in words is "sixty-four million, four hundred seventy-six thousand, six hundred thirty-six".