215400464 has 20 divisors (see below), whose sum is σ = 417578556. Its totient is φ = 107638272.

The previous prime is 215400461. The next prime is 215400467. The reversal of 215400464 is 464004512.

It is an interprime number because it is at equal distance from previous prime (215400461) and next prime (215400467).

It can be written as a sum of positive squares in 2 ways, for example, as 13987600 + 201412864 = 3740^2 + 14192^2 .

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (215400461) 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, 39572 + ... + 44684.

Almost surely, 2^215400464 is an apocalyptic number.

It is an amenable number.

215400464 is a deficient number, since it is larger than the sum of its proper divisors (202178092).

215400464 is a wasteful number, since it uses less digits than its factorization.

215400464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7754 (or 7748 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 215400464 is about 14676.5276547281. The cubic root of 215400464 is about 599.4443596726. Note that the first 3 decimals are identical.

Adding to 215400464 its reverse (464004512), we get a palindrome (679404976).

The spelling of 215400464 in words is "two hundred fifteen million, four hundred thousand, four hundred sixty-four".