55139782 has 4 divisors (see below), whose sum is σ = 82709676. Its totient is φ = 27569890.

The previous prime is 55139779. The next prime is 55139783. The reversal of 55139782 is 28793155.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55139783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13784944 + ... + 13784947.

It is an arithmetic number, because the mean of its divisors is an integer number (20677419).

Almost surely, 2^55139782 is an apocalyptic number.

55139782 is a deficient number, since it is larger than the sum of its proper divisors (27569894).

55139782 is a wasteful number, since it uses less digits than its factorization.

55139782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27569893.

The product of its digits is 75600, while the sum is 40.

The square root of 55139782 is about 7425.6166073936. The cubic root of 55139782 is about 380.6171458317.

The spelling of 55139782 in words is "fifty-five million, one hundred thirty-nine thousand, seven hundred eighty-two".