647937225 has 120 divisors (see below), whose sum is σ = 1309068992. Its totient is φ = 314928000.

The previous prime is 647937217. The next prime is 647937239. The reversal of 647937225 is 522739746.

It is not a de Polignac number, because 647937225 - 2³ = 647937217 is a prime.

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

It is a Duffinian number.

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3974994 + ... + 3975156.

Almost surely, 2^647937225 is an apocalyptic number.

647937225 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

647937225 is an abundant number, since it is smaller than the sum of its proper divisors (661131767).

647937225 is a wasteful number, since it uses less digits than its factorization.

647937225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 335 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 647937225 is about 25454.6110754024. The cubic root of 647937225 is about 865.3217976966.

The spelling of 647937225 in words is "six hundred forty-seven million, nine hundred thirty-seven thousand, two hundred twenty-five".