55293840 has 400 divisors, whose sum is σ = 233342208. Its totient is φ = 11860992.

The previous prime is 55293811. The next prime is 55293841. The reversal of 55293840 is 4839255.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 55293795 and 55293804.

It is not an unprimeable number, because it can be changed into a prime (55293841) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1043254 + ... + 1043306.

Almost surely, 2^55293840 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 55293840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116671104).

55293840 is an abundant number, since it is smaller than the sum of its proper divisors (178048368).

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

55293840 is a wasteful number, since it uses less digits than its factorization.

55293840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 55293840 is about 7435.9827864244. The cubic root of 55293840 is about 380.9712917795.

The spelling of 55293840 in words is "fifty-five million, two hundred ninety-three thousand, eight hundred forty".