55139770 has 16 divisors (see below), whose sum is σ = 113430528. Its totient is φ = 18905040.

The previous prime is 55139743. The next prime is 55139779. The reversal of 55139770 is 7793155.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (55139779) 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, 393786 + ... + 393925.

It is an arithmetic number, because the mean of its divisors is an integer number (7089408).

Almost surely, 2^55139770 is an apocalyptic number.

55139770 is an abundant number, since it is smaller than the sum of its proper divisors (58290758).

55139770 is a wasteful number, since it uses less digits than its factorization.

55139770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787725.

The product of its (nonzero) digits is 33075, while the sum is 37.

The square root of 55139770 is about 7425.6157993799. The cubic root of 55139770 is about 380.6171182207.

The spelling of 55139770 in words is "fifty-five million, one hundred thirty-nine thousand, seven hundred seventy".