647692040 has 32 divisors (see below), whose sum is σ = 1459638360. Its totient is φ = 258662400.

The previous prime is 647692037. The next prime is 647692049. The reversal of 647692040 is 40296746.

It can be written as a sum of positive squares in 4 ways, for example, as 530749444 + 116942596 = 23038^2 + 10814^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 647691985 and 647692003.

It is not an unprimeable number, because it can be changed into a prime (647692049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13010 + ... + 38270.

Almost surely, 2^647692040 is an apocalyptic number.

It is an amenable number.

647692040 is an abundant number, since it is smaller than the sum of its proper divisors (811946320).

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

647692040 is a wasteful number, since it uses less digits than its factorization.

647692040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25913 (or 25909 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 647692040 is about 25449.7944981880. The cubic root of 647692040 is about 865.2126355309.

The spelling of 647692040 in words is "six hundred forty-seven million, six hundred ninety-two thousand, forty".