55869840 has 240 divisors, whose sum is σ = 207986688. Its totient is φ = 13353984.

The previous prime is 55869787. The next prime is 55869841. The reversal of 55869840 is 4896855.

55869840 is a `hidden beast` number, since 558 + 6 + 98 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (55869841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 439857 + ... + 439983.

Almost surely, 2^55869840 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 55869840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103993344).

55869840 is an abundant number, since it is smaller than the sum of its proper divisors (152116848).

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

55869840 is a wasteful number, since it uses less digits than its factorization.

55869840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 55869840 is about 7474.6130334620. The cubic root of 55869840 is about 382.2895933664.

The spelling of 55869840 in words is "fifty-five million, eight hundred sixty-nine thousand, eight hundred forty".