672471640 has 32 divisors (see below), whose sum is σ = 1514137680. Its totient is φ = 268797312.

The previous prime is 672471619. The next prime is 672471643. The reversal of 672471640 is 46174276.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 672471640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672471643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59914 + ... + 70246.

Almost surely, 2^672471640 is an apocalyptic number.

It is an amenable number.

672471640 is an abundant number, since it is smaller than the sum of its proper divisors (841666040).

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

672471640 is a wasteful number, since it uses less digits than its factorization.

672471640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11971 (or 11967 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 672471640 is about 25932.0581520249. The cubic root of 672471640 is about 876.1086963666.

The spelling of 672471640 in words is "six hundred seventy-two million, four hundred seventy-one thousand, six hundred forty".