3639812064 has 384 divisors, whose sum is σ = 12497587200. Its totient is φ = 902430720.

The previous prime is 3639812009. The next prime is 3639812093. The reversal of 3639812064 is 4602189363.

It is a super-2 number, since 2×3639812064² = 26496463722479880192, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8899092 + ... + 8899500.

It is an arithmetic number, because the mean of its divisors is an integer number (32545800).

Almost surely, 2^3639812064 is an apocalyptic number.

3639812064 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3639812064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6248793600).

3639812064 is an abundant number, since it is smaller than the sum of its proper divisors (8857775136).

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

3639812064 is a wasteful number, since it uses less digits than its factorization.

3639812064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 3639812064 is about 60330.8549914552. The cubic root of 3639812064 is about 1538.2478616448.

The spelling of 3639812064 in words is "three billion, six hundred thirty-nine million, eight hundred twelve thousand, sixty-four".