54128978 has 4 divisors (see below), whose sum is σ = 81193470. Its totient is φ = 27064488.

The previous prime is 54128957. The next prime is 54129017. The reversal of 54128978 is 87982145.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87982145 = 5 ⋅17596429.

It can be written as a sum of positive squares in only one way, i.e., 49519369 + 4609609 = 7037^2 + 2147^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13532243 + ... + 13532246.

Almost surely, 2^54128978 is an apocalyptic number.

54128978 is a deficient number, since it is larger than the sum of its proper divisors (27064492).

54128978 is a wasteful number, since it uses less digits than its factorization.

54128978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27064491.

The product of its digits is 161280, while the sum is 44.

The square root of 54128978 is about 7357.2398356993. The cubic root of 54128978 is about 378.2770055070.

The spelling of 54128978 in words is "fifty-four million, one hundred twenty-eight thousand, nine hundred seventy-eight".