55864820 has 48 divisors (see below), whose sum is σ = 131459328. Its totient is φ = 19762560.

The previous prime is 55864747. The next prime is 55864841. The reversal of 55864820 is 2846855.

It is a super-2 number, since 2×55864820² = 6241756227264800, which contains 22 as substring.

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, 4709 + ... + 11571.

It is an arithmetic number, because the mean of its divisors is an integer number (2738736).

Almost surely, 2^55864820 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 55864820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65729664).

55864820 is an abundant number, since it is smaller than the sum of its proper divisors (75594508).

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

55864820 is a wasteful number, since it uses less digits than its factorization.

55864820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6920 (or 6918 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 38.

The square root of 55864820 is about 7474.2772225815. The cubic root of 55864820 is about 382.2781432338.

The spelling of 55864820 in words is "fifty-five million, eight hundred sixty-four thousand, eight hundred twenty".