649077720 has 32 divisors (see below), whose sum is σ = 1947233520. Its totient is φ = 173087360.

The previous prime is 649077707. The next prime is 649077761. The reversal of 649077720 is 27770946.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2704371 + ... + 2704610.

Almost surely, 2^649077720 is an apocalyptic number.

649077720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

649077720 is an abundant number, since it is smaller than the sum of its proper divisors (1298155800).

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

649077720 is a wasteful number, since it uses less digits than its factorization.

649077720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5408995 (or 5408991 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 42.

The square root of 649077720 is about 25477.0037484787. The cubic root of 649077720 is about 865.8292114136.

It can be divided in two parts, 64907 and 7720, that added together give a palindrome (72627).

The spelling of 649077720 in words is "six hundred forty-nine million, seventy-seven thousand, seven hundred twenty".