648632737 has 2 divisors, whose sum is σ = 648632738. Its totient is φ = 648632736.

The previous prime is 648632713. The next prime is 648632767. The reversal of 648632737 is 737236846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 498227041 + 150405696 = 22321^2 + 12264^2 .

It is a cyclic number.

It is not a de Polignac number, because 648632737 - 2¹⁵ = 648599969 is a prime.

It is a super-2 number, since 2×648632737² = 841448855016222338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (648632707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324316368 + 324316369.

It is an arithmetic number, because the mean of its divisors is an integer number (324316369).

Almost surely, 2^648632737 is an apocalyptic number.

It is an amenable number.

648632737 is a deficient number, since it is larger than the sum of its proper divisors (1).

648632737 is an equidigital number, since it uses as much as digits as its factorization.

648632737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 46.

The square root of 648632737 is about 25468.2692187750. The cubic root of 648632737 is about 865.6313063215.

It can be divided in two parts, 64863 and 2737, that added together give a square (67600 = 260²).

The spelling of 648632737 in words is "six hundred forty-eight million, six hundred thirty-two thousand, seven hundred thirty-seven".