647504396 has 72 divisors (see below), whose sum is σ = 1430016000. Its totient is φ = 251111520.

The previous prime is 647504393. The next prime is 647504399. The reversal of 647504396 is 693405746.

It is an interprime number because it is at equal distance from previous prime (647504393) and next prime (647504399).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647504393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1297355 + ... + 1297853.

Almost surely, 2^647504396 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 647504396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (715008000).

647504396 is an abundant number, since it is smaller than the sum of its proper divisors (782511604).

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

647504396 is a wasteful number, since it uses less digits than its factorization.

647504396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915 (or 902 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 44.

The square root of 647504396 is about 25446.1076787787. The cubic root of 647504396 is about 865.1290733693.

The spelling of 647504396 in words is "six hundred forty-seven million, five hundred four thousand, three hundred ninety-six".