55238815 has 4 divisors (see below), whose sum is σ = 66286584. Its totient is φ = 44191048.

The previous prime is 55238803. The next prime is 55238837. The reversal of 55238815 is 51883255.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51883255 = 5 ⋅10376651.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55238815 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5523877 + ... + 5523886.

It is an arithmetic number, because the mean of its divisors is an integer number (16571646).

Almost surely, 2^55238815 is an apocalyptic number.

55238815 is a deficient number, since it is larger than the sum of its proper divisors (11047769).

55238815 is a wasteful number, since it uses less digits than its factorization.

55238815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11047768.

The product of its digits is 48000, while the sum is 37.

The square root of 55238815 is about 7432.2819510565. The cubic root of 55238815 is about 380.8448768368.

The spelling of 55238815 in words is "fifty-five million, two hundred thirty-eight thousand, eight hundred fifteen".