55453815 has 24 divisors (see below), whose sum is σ = 99682128. Its totient is φ = 29574720.

The previous prime is 55453781. The next prime is 55453817. The reversal of 55453815 is 51835455.

It is a happy number.

It is not a de Polignac number, because 55453815 - 2¹⁶ = 55388279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55453815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55453817) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21606 + ... + 24035.

It is an arithmetic number, because the mean of its divisors is an integer number (4153422).

Almost surely, 2^55453815 is an apocalyptic number.

55453815 is a deficient number, since it is larger than the sum of its proper divisors (44228313).

55453815 is an equidigital number, since it uses as much as digits as its factorization.

55453815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45661 (or 45649 counting only the distinct ones).

The product of its digits is 60000, while the sum is 36.

The square root of 55453815 is about 7446.7318334958. The cubic root of 55453815 is about 381.3383441244.

The spelling of 55453815 in words is "fifty-five million, four hundred fifty-three thousand, eight hundred fifteen".