648951615 has 64 divisors (see below), whose sum is σ = 1261209600. Its totient is φ = 314658432.

The previous prime is 648951587. The next prime is 648951617. The reversal of 648951615 is 516159846.

648951615 is a `hidden beast` number, since 6 + 489 + 5 + 161 + 5 = 666.

It is not a de Polignac number, because 648951615 - 2¹⁸ = 648689471 is a prime.

It is a super-2 number, since 2×648951615² = 842276397222216450, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648951617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 114826 + ... + 120344.

It is an arithmetic number, because the mean of its divisors is an integer number (19706400).

Almost surely, 2^648951615 is an apocalyptic number.

648951615 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

648951615 is a deficient number, since it is larger than the sum of its proper divisors (612257985).

648951615 is a wasteful number, since it uses less digits than its factorization.

648951615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5613 (or 5607 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 648951615 is about 25474.5287493214. The cubic root of 648951615 is about 865.7731357126.

The spelling of 648951615 in words is "six hundred forty-eight million, nine hundred fifty-one thousand, six hundred fifteen".