55266840 has 128 divisors (see below), whose sum is σ = 187012800. Its totient is φ = 14515200.

The previous prime is 55266833. The next prime is 55266851. The reversal of 55266840 is 4866255.

55266840 is a `hidden beast` number, since 552 + 6 + 68 + 40 = 666.

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 = 55266795 and 55266804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78490 + ... + 79190.

Almost surely, 2^55266840 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 55266840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93506400).

55266840 is an abundant number, since it is smaller than the sum of its proper divisors (131745960).

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

55266840 is a wasteful number, since it uses less digits than its factorization.

55266840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 55266840 is about 7434.1670683406. The cubic root of 55266840 is about 380.9092722152.

The spelling of 55266840 in words is "fifty-five million, two hundred sixty-six thousand, eight hundred forty".