55639879 has 8 divisors (see below), whose sum is σ = 56769440. Its totient is φ = 54521856.

The previous prime is 55639873. The next prime is 55639889. The reversal of 55639879 is 97893655.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55639879 - 2¹⁹ = 55115591 is a prime.

It is a super-2 number, since 2×55639879² = 6191592270269282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55639873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7207 + ... + 12775.

It is an arithmetic number, because the mean of its divisors is an integer number (7096180).

Almost surely, 2^55639879 is an apocalyptic number.

55639879 is a deficient number, since it is larger than the sum of its proper divisors (1129561).

55639879 is a wasteful number, since it uses less digits than its factorization.

55639879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5769.

The product of its digits is 2041200, while the sum is 52.

The square root of 55639879 is about 7459.2143688193. The cubic root of 55639879 is about 381.7643690893.

The spelling of 55639879 in words is "fifty-five million, six hundred thirty-nine thousand, eight hundred seventy-nine".