54865815 has 16 divisors (see below), whose sum is σ = 90617856. Its totient is φ = 28317600.

The previous prime is 54865801. The next prime is 54865829. The reversal of 54865815 is 51856845.

It is an interprime number because it is at equal distance from previous prime (54865801) and next prime (54865829).

It is not a de Polignac number, because 54865815 - 2⁴ = 54865799 is a prime.

It is a super-2 number, since 2×54865815² = 6020515311228450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58531 + ... + 59460.

It is an arithmetic number, because the mean of its divisors is an integer number (5663616).

Almost surely, 2^54865815 is an apocalyptic number.

54865815 is a deficient number, since it is larger than the sum of its proper divisors (35752041).

54865815 is a wasteful number, since it uses less digits than its factorization.

54865815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118030.

The product of its digits is 192000, while the sum is 42.

The square root of 54865815 is about 7407.1462115986. The cubic root of 54865815 is about 379.9857219935.

The spelling of 54865815 in words is "fifty-four million, eight hundred sixty-five thousand, eight hundred fifteen".