8649972 has 36 divisors (see below), whose sum is σ = 21977956. Its totient is φ = 2868480.

The previous prime is 8649967. The next prime is 8649973. The reversal of 8649972 is 2799468.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7001316 + 1648656 = 2646^2 + 1284^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8649973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8178 + ... + 9174.

Almost surely, 2^8649972 is an apocalyptic number.

It is an amenable number.

8649972 is an abundant number, since it is smaller than the sum of its proper divisors (13327984).

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

8649972 is a wasteful number, since it uses less digits than its factorization.

8649972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248 (or 1243 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 8649972 is about 2941.0834738239. The cubic root of 8649972 is about 205.2760271387.

The spelling of 8649972 in words is "eight million, six hundred forty-nine thousand, nine hundred seventy-two".