55477440 has 112 divisors (see below), whose sum is σ = 195742560. Its totient is φ = 14791680.

The previous prime is 55477423. The next prime is 55477441. The reversal of 55477440 is 4477455.

55477440 is a `hidden beast` number, since 5 + 547 + 74 + 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 = 55477395 and 55477404.

It is not an unprimeable number, because it can be changed into a prime (55477441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5430 + ... + 11850.

Almost surely, 2^55477440 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 55477440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97871280).

55477440 is an abundant number, since it is smaller than the sum of its proper divisors (140265120).

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

55477440 is a wasteful number, since it uses less digits than its factorization.

55477440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6447 (or 6431 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 36.

The square root of 55477440 is about 7448.3179309157. The cubic root of 55477440 is about 381.3924903198.

The spelling of 55477440 in words is "fifty-five million, four hundred seventy-seven thousand, four hundred forty".