55279240 has 32 divisors (see below), whose sum is σ = 131696280. Its totient is φ = 20810752.

The previous prime is 55279201. The next prime is 55279271. The reversal of 55279240 is 4297255.

It can be written as a sum of positive squares in 4 ways, for example, as 42276004 + 13003236 = 6502^2 + 3606^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 55279196 and 55279205.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39967 + ... + 41326.

Almost surely, 2^55279240 is an apocalyptic number.

It is an amenable number.

55279240 is an abundant number, since it is smaller than the sum of its proper divisors (76417040).

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

55279240 is a wasteful number, since it uses less digits than its factorization.

55279240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81321 (or 81317 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 55279240 is about 7435.0010087424. The cubic root of 55279240 is about 380.9377577819.

The spelling of 55279240 in words is "fifty-five million, two hundred seventy-nine thousand, two hundred forty".