55392278 has 4 divisors (see below), whose sum is σ = 83088420. Its totient is φ = 27696138.

The previous prime is 55392241. The next prime is 55392287. The reversal of 55392278 is 87229355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87229355 = 5 ⋅17445871.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13848068 + ... + 13848071.

It is an arithmetic number, because the mean of its divisors is an integer number (20772105).

Almost surely, 2^55392278 is an apocalyptic number.

55392278 is a deficient number, since it is larger than the sum of its proper divisors (27696142).

55392278 is a wasteful number, since it uses less digits than its factorization.

55392278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27696141.

The product of its digits is 151200, while the sum is 41.

The square root of 55392278 is about 7442.5988740493. The cubic root of 55392278 is about 381.1972350877.

The spelling of 55392278 in words is "fifty-five million, three hundred ninety-two thousand, two hundred seventy-eight".