648993537 has 6 divisors (see below), whose sum is σ = 937435122. Its totient is φ = 432662352.

The previous prime is 648993503. The next prime is 648993559. The reversal of 648993537 is 735399846.

648993537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 513294336 + 135699201 = 22656^2 + 11649^2 .

It is not a de Polignac number, because 648993537 - 2⁶ = 648993473 is a prime.

It is a super-2 number, since 2×648993537² = 842385222135540738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (648993337) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36055188 + ... + 36055205.

It is an arithmetic number, because the mean of its divisors is an integer number (156239187).

Almost surely, 2^648993537 is an apocalyptic number.

It is an amenable number.

648993537 is a deficient number, since it is larger than the sum of its proper divisors (288441585).

648993537 is a wasteful number, since it uses less digits than its factorization.

648993537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72110399 (or 72110396 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The square root of 648993537 is about 25475.3515579275. The cubic root of 648993537 is about 865.7917781707.

The spelling of 648993537 in words is "six hundred forty-eight million, nine hundred ninety-three thousand, five hundred thirty-seven".