55128542 has 8 divisors (see below), whose sum is σ = 94506096. Its totient is φ = 23626512.

The previous prime is 55128523. The next prime is 55128551. The reversal of 55128542 is 24582155.

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

It is a super-2 number, since 2×55128542² = 6078312286091528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55128499 and 55128508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1968863 + ... + 1968890.

It is an arithmetic number, because the mean of its divisors is an integer number (11813262).

Almost surely, 2^55128542 is an apocalyptic number.

55128542 is a deficient number, since it is larger than the sum of its proper divisors (39377554).

55128542 is a wasteful number, since it uses less digits than its factorization.

55128542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3937762.

The product of its digits is 16000, while the sum is 32.

The square root of 55128542 is about 7424.8597293148. The cubic root of 55128542 is about 380.5912817019.

The spelling of 55128542 in words is "fifty-five million, one hundred twenty-eight thousand, five hundred forty-two".