55621040 has 20 divisors (see below), whose sum is σ = 129319104. Its totient is φ = 22248384.

The previous prime is 55621031. The next prime is 55621063. The reversal of 55621040 is 4012655.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 55620997 and 55621015.

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, 347552 + ... + 347711.

Almost surely, 2^55621040 is an apocalyptic number.

It is an amenable number.

55621040 is an abundant number, since it is smaller than the sum of its proper divisors (73698064).

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

55621040 is a wasteful number, since it uses less digits than its factorization.

55621040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695276 (or 695270 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 55621040 is about 7457.9514613599. The cubic root of 55621040 is about 381.7212772701.

Adding to 55621040 its reverse (4012655), we get a palindrome (59633695).

The spelling of 55621040 in words is "fifty-five million, six hundred twenty-one thousand, forty".