649975731 has 8 divisors (see below), whose sum is σ = 912246720. Its totient is φ = 410510952.

The previous prime is 649975727. The next prime is 649975741. The reversal of 649975731 is 137579946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649975731 - 2² = 649975727 is a prime.

It is a super-2 number, since 2×649975731² = 844936901777968722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649975741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5701485 + ... + 5701598.

It is an arithmetic number, because the mean of its divisors is an integer number (114030840).

Almost surely, 2^649975731 is an apocalyptic number.

649975731 is a deficient number, since it is larger than the sum of its proper divisors (262270989).

649975731 is a wasteful number, since it uses less digits than its factorization.

649975731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11403105.

The product of its digits is 1428840, while the sum is 51.

The square root of 649975731 is about 25494.6216092728. The cubic root of 649975731 is about 866.2283243058.

The spelling of 649975731 in words is "six hundred forty-nine million, nine hundred seventy-five thousand, seven hundred thirty-one".