647440272 has 30 divisors (see below), whose sum is σ = 1811933942. Its totient is φ = 215813376.

The previous prime is 647440249. The next prime is 647440289. The reversal of 647440272 is 272044746.

It is a happy number.

647440272 is a `hidden beast` number, since 647 + 4 + 4 + 0 + 2 + 7 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 355850496 + 291589776 = 18864^2 + 17076^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2247913 + ... + 2248200.

Almost surely, 2^647440272 is an apocalyptic number.

It is an amenable number.

647440272 is an abundant number, since it is smaller than the sum of its proper divisors (1164493670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647440272 is a wasteful number, since it uses less digits than its factorization.

647440272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4496127 (or 4496118 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 36.

The square root of 647440272 is about 25444.8476513419. The cubic root of 647440272 is about 865.1005137856.

The spelling of 647440272 in words is "six hundred forty-seven million, four hundred forty thousand, two hundred seventy-two".