215451472 has 20 divisors (see below), whose sum is σ = 441992916. Its totient is φ = 101388800.

The previous prime is 215451461. The next prime is 215451479. The reversal of 215451472 is 274154512.

215451472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 202663696 + 12787776 = 14236^2 + 3576^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215451479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395779 + ... + 396322.

Almost surely, 2^215451472 is an apocalyptic number.

It is an amenable number.

215451472 is an abundant number, since it is smaller than the sum of its proper divisors (226541444).

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

215451472 is a wasteful number, since it uses less digits than its factorization.

215451472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792126 (or 792120 counting only the distinct ones).

The product of its digits is 11200, while the sum is 31.

The square root of 215451472 is about 14678.2652926018. The cubic root of 215451472 is about 599.4916731650.

The spelling of 215451472 in words is "two hundred fifteen million, four hundred fifty-one thousand, four hundred seventy-two".