55821954 has 16 divisors (see below), whose sum is σ = 113474880. Its totient is φ = 18302160.

The previous prime is 55821929. The next prime is 55821959. The reversal of 55821954 is 45912855.

It is not an unprimeable number, because it can be changed into a prime (55821959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75894 + ... + 76625.

It is an arithmetic number, because the mean of its divisors is an integer number (7092180).

Almost surely, 2^55821954 is an apocalyptic number.

55821954 is an abundant number, since it is smaller than the sum of its proper divisors (57652926).

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

55821954 is a wasteful number, since it uses less digits than its factorization.

55821954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152585.

The product of its digits is 72000, while the sum is 39.

The square root of 55821954 is about 7471.4091040446. The cubic root of 55821954 is about 382.1803421015.

Subtracting from 55821954 its reverse (45912855), we obtain a palindrome (9909099).

The spelling of 55821954 in words is "fifty-five million, eight hundred twenty-one thousand, nine hundred fifty-four".