215451432 has 144 divisors (see below), whose sum is σ = 684639540. Its totient is φ = 61028352.

The previous prime is 215451403. The next prime is 215451443. The reversal of 215451432 is 234154512.

215451432 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 207532836 + 7918596 = 14406^2 + 2814^2 .

It is a junction number, because it is equal to n+sod(n) for n = 215451396 and 215451405.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 610168 + ... + 610520.

Almost surely, 2^215451432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215451432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342319770).

215451432 is an abundant number, since it is smaller than the sum of its proper divisors (469188108).

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

215451432 is a wasteful number, since it uses less digits than its factorization.

215451432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 538 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 215451432 is about 14678.2639300430. The cubic root of 215451432 is about 599.4916360652.

The spelling of 215451432 in words is "two hundred fifteen million, four hundred fifty-one thousand, four hundred thirty-two".