55617279 has 16 divisors (see below), whose sum is σ = 76360704. Its totient is φ = 35985600.

The previous prime is 55617277. The next prime is 55617293. The reversal of 55617279 is 97271655.

It is not a de Polignac number, because 55617279 - 2¹ = 55617277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55617279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55617277) 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, 24882 + ... + 27024.

It is an arithmetic number, because the mean of its divisors is an integer number (4772544).

Almost surely, 2^55617279 is an apocalyptic number.

55617279 is a deficient number, since it is larger than the sum of its proper divisors (20743425).

55617279 is a wasteful number, since it uses less digits than its factorization.

55617279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398.

The product of its digits is 132300, while the sum is 42.

The square root of 55617279 is about 7457.6993101090. The cubic root of 55617279 is about 381.7126732953.

The spelling of 55617279 in words is "fifty-five million, six hundred seventeen thousand, two hundred seventy-nine".