55612440 has 256 divisors, whose sum is σ = 212284800. Its totient is φ = 12828672.

The previous prime is 55612439. The next prime is 55612463. The reversal of 55612440 is 4421655.

55612440 is a `hidden beast` number, since 5 + 5 + 612 + 4 + 40 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 238564 + ... + 238796.

Almost surely, 2^55612440 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 55612440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106142400).

55612440 is an abundant number, since it is smaller than the sum of its proper divisors (156672360).

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

55612440 is a wasteful number, since it uses less digits than its factorization.

55612440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283 (or 273 counting only the distinct ones).

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

The square root of 55612440 is about 7457.3748732379. The cubic root of 55612440 is about 381.7016026278.

It can be divided in two parts, 5561 and 2440, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 55612440 in words is "fifty-five million, six hundred twelve thousand, four hundred forty".