649732590 has 80 divisors (see below), whose sum is σ = 1881478368. Its totient is φ = 159931584.

The previous prime is 649732583. The next prime is 649732619. The reversal of 649732590 is 95237946.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 20322 + ... + 41381.

Almost surely, 2^649732590 is an apocalyptic number.

649732590 is an abundant number, since it is smaller than the sum of its proper divisors (1231745778).

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

649732590 is a wasteful number, since it uses less digits than its factorization.

649732590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61735 (or 61726 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 649732590 is about 25489.8526869027. The cubic root of 649732590 is about 866.1202987911.

The spelling of 649732590 in words is "six hundred forty-nine million, seven hundred thirty-two thousand, five hundred ninety".