55051620 has 96 divisors (see below), whose sum is σ = 167405952. Its totient is φ = 13436928.

The previous prime is 55051603. The next prime is 55051631. The reversal of 55051620 is 2615055.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126924 + ... + 127356.

It is an arithmetic number, because the mean of its divisors is an integer number (1743812).

Almost surely, 2^55051620 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 55051620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83702976).

55051620 is an abundant number, since it is smaller than the sum of its proper divisors (112354332).

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

55051620 is a wasteful number, since it uses less digits than its factorization.

55051620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 55051620 is about 7419.6778905826. The cubic root of 55051620 is about 380.4141836660.

Adding to 55051620 its reverse (2615055), we get a palindrome (57666675).

The spelling of 55051620 in words is "fifty-five million, fifty-one thousand, six hundred twenty".