55249740 has 144 divisors (see below), whose sum is σ = 206326848. Its totient is φ = 11653632.

The previous prime is 55249721. The next prime is 55249751. The reversal of 55249740 is 4794255.

55249740 is a `hidden beast` number, since 5 + 524 + 97 + 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 = 55249695 and 55249704.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14694 + ... + 18066.

Almost surely, 2^55249740 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 55249740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103163424).

55249740 is an abundant number, since it is smaller than the sum of its proper divisors (151077108).

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

55249740 is a wasteful number, since it uses less digits than its factorization.

55249740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3408 (or 3403 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 55249740 is about 7433.0168841460. The cubic root of 55249740 is about 380.8699827097.

The spelling of 55249740 in words is "fifty-five million, two hundred forty-nine thousand, seven hundred forty".