649807750 has 16 divisors (see below), whose sum is σ = 1216440576. Its totient is φ = 259923000.

The previous prime is 649807721. The next prime is 649807777. The reversal of 649807750 is 57708946.

It is a happy number.

It is a super-2 number, since 2×649807750² = 844500223920125000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 649807750.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1299366 + ... + 1299865.

It is an arithmetic number, because the mean of its divisors is an integer number (76027536).

Almost surely, 2^649807750 is an apocalyptic number.

649807750 is a deficient number, since it is larger than the sum of its proper divisors (566632826).

649807750 is a wasteful number, since it uses less digits than its factorization.

649807750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599248 (or 2599238 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 649807750 is about 25491.3269564376. The cubic root of 649807750 is about 866.1536946284.

The spelling of 649807750 in words is "six hundred forty-nine million, eight hundred seven thousand, seven hundred fifty".