640153476 has 48 divisors (see below), whose sum is σ = 1661296000. Its totient is φ = 213173856.

The previous prime is 640153471. The next prime is 640153483. The reversal of 640153476 is 674351046.

It is a happy number.

640153476 is a `hidden beast` number, since 640 + 1 + 5 + 3 + 4 + 7 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 640153476.

It is not an unprimeable number, because it can be changed into a prime (640153471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138450 + ... + 142998.

Almost surely, 2^640153476 is an apocalyptic number.

It is an amenable number.

640153476 is an abundant number, since it is smaller than the sum of its proper divisors (1021142524).

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

640153476 is a wasteful number, since it uses less digits than its factorization.

640153476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5865 (or 5857 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 640153476 is about 25301.2544353042. The cubic root of 640153476 is about 861.8427567609.

The spelling of 640153476 in words is "six hundred forty million, one hundred fifty-three thousand, four hundred seventy-six".