215561488 has 10 divisors (see below), whose sum is σ = 417650414. Its totient is φ = 107780736.

The previous prime is 215561483. The next prime is 215561557. The reversal of 215561488 is 884165512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 194658304 + 20903184 = 13952^2 + 4572^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 215561488.

It is not an unprimeable number, because it can be changed into a prime (215561483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6736281 + ... + 6736312.

Almost surely, 2^215561488 is an apocalyptic number.

It is an amenable number.

215561488 is a deficient number, since it is larger than the sum of its proper divisors (202088926).

215561488 is a wasteful number, since it uses less digits than its factorization.

215561488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13472601 (or 13472595 counting only the distinct ones).

The product of its digits is 76800, while the sum is 40.

The square root of 215561488 is about 14682.0123961261. The cubic root of 215561488 is about 599.5936952933.

The spelling of 215561488 in words is "two hundred fifteen million, five hundred sixty-one thousand, four hundred eighty-eight".