649948440 has 64 divisors (see below), whose sum is σ = 1995206400. Its totient is φ = 169287552.

The previous prime is 649948427. The next prime is 649948451. The reversal of 649948440 is 44849946.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 649948440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57820 + ... + 68139.

It is an arithmetic number, because the mean of its divisors is an integer number (31175100).

Almost surely, 2^649948440 is an apocalyptic number.

649948440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

649948440 is an abundant number, since it is smaller than the sum of its proper divisors (1345257960).

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

649948440 is a wasteful number, since it uses less digits than its factorization.

649948440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126016 (or 126012 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 48.

The square root of 649948440 is about 25494.0863731180. The cubic root of 649948440 is about 866.2162004849.

The spelling of 649948440 in words is "six hundred forty-nine million, nine hundred forty-eight thousand, four hundred forty".