215479478 has 4 divisors (see below), whose sum is σ = 323219220. Its totient is φ = 107739738.

The previous prime is 215479469. The next prime is 215479501. The reversal of 215479478 is 874974512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53869868 + ... + 53869871.

It is an arithmetic number, because the mean of its divisors is an integer number (80804805).

Almost surely, 2^215479478 is an apocalyptic number.

215479478 is a deficient number, since it is larger than the sum of its proper divisors (107739742).

215479478 is a wasteful number, since it uses less digits than its factorization.

215479478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107739741.

The product of its digits is 564480, while the sum is 47.

The square root of 215479478 is about 14679.2192571676. The cubic root of 215479478 is about 599.5176475159.

The spelling of 215479478 in words is "two hundred fifteen million, four hundred seventy-nine thousand, four hundred seventy-eight".