55393240 has 64 divisors (see below), whose sum is σ = 143357760. Its totient is φ = 18869760.

The previous prime is 55393237. The next prime is 55393253. The reversal of 55393240 is 4239355.

It is a super-2 number, since 2×55393240² = 6136822075395200, 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, 50134 + ... + 51226.

It is an arithmetic number, because the mean of its divisors is an integer number (2239965).

Almost surely, 2^55393240 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 55393240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71678880).

55393240 is an abundant number, since it is smaller than the sum of its proper divisors (87964520).

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

55393240 is a wasteful number, since it uses less digits than its factorization.

55393240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292 (or 1288 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 55393240 is about 7442.6635017311. The cubic root of 55393240 is about 381.1994418310.

The spelling of 55393240 in words is "fifty-five million, three hundred ninety-three thousand, two hundred forty".