55420416 has 160 divisors (see below), whose sum is σ = 173500800. Its totient is φ = 17418240.

The previous prime is 55420381. The next prime is 55420427. The reversal of 55420416 is 61402455.

It is a super-2 number, since 2×55420416² = 6142845019226112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 55420416.

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, 262551 + ... + 262761.

It is an arithmetic number, because the mean of its divisors is an integer number (1084380).

Almost surely, 2^55420416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55420416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86750400).

55420416 is an abundant number, since it is smaller than the sum of its proper divisors (118080384).

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

55420416 is a wasteful number, since it uses less digits than its factorization.

55420416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 55420416 is about 7444.4889683577. The cubic root of 55420416 is about 381.2617706301.

The spelling of 55420416 in words is "fifty-five million, four hundred twenty thousand, four hundred sixteen".