649765957 has 4 divisors (see below), whose sum is σ = 650706976. Its totient is φ = 648824940.

The previous prime is 649765937. The next prime is 649765969. The reversal of 649765957 is 759567946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 649765957 - 2⁷ = 649765829 is a prime.

It is a super-2 number, since 2×649765957² = 844391597752251698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649765937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469473 + ... + 470854.

It is an arithmetic number, because the mean of its divisors is an integer number (162676744).

Almost surely, 2^649765957 is an apocalyptic number.

It is an amenable number.

649765957 is a deficient number, since it is larger than the sum of its proper divisors (941019).

649765957 is an equidigital number, since it uses as much as digits as its factorization.

649765957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941018.

The product of its digits is 14288400, while the sum is 58.

The square root of 649765957 is about 25490.5071938555. The cubic root of 649765957 is about 866.1351250657.

The spelling of 649765957 in words is "six hundred forty-nine million, seven hundred sixty-five thousand, nine hundred fifty-seven".