55551378 has 32 divisors (see below), whose sum is σ = 113356800. Its totient is φ = 18145296.

The previous prime is 55551361. The next prime is 55551389. The reversal of 55551378 is 87315555.

It is a Curzon 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, 76903 + ... + 77621.

It is an arithmetic number, because the mean of its divisors is an integer number (3542400).

Almost surely, 2^55551378 is an apocalyptic number.

55551378 is an abundant number, since it is smaller than the sum of its proper divisors (57805422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55551378 is a wasteful number, since it uses less digits than its factorization.

55551378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966.

The product of its digits is 105000, while the sum is 39.

The square root of 55551378 is about 7453.2796807848. The cubic root of 55551378 is about 381.5618497300.

The spelling of 55551378 in words is "fifty-five million, five hundred fifty-one thousand, three hundred seventy-eight".