54939978 has 32 divisors (see below), whose sum is σ = 126302400. Its totient is φ = 17681328.

The previous prime is 54939961. The next prime is 54939979. The reversal of 54939978 is 87993945.

54939978 is a `hidden beast` number, since 549 + 3 + 9 + 97 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (54939979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15976 + ... + 19107.

It is an arithmetic number, because the mean of its divisors is an integer number (3946950).

Almost surely, 2^54939978 is an apocalyptic number.

54939978 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

54939978 is an abundant number, since it is smaller than the sum of its proper divisors (71362422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

54939978 is a wasteful number, since it uses less digits than its factorization.

54939978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35123 (or 35117 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 54939978 is about 7412.1507000330. The cubic root of 54939978 is about 380.1568558353.

The spelling of 54939978 in words is "fifty-four million, nine hundred thirty-nine thousand, nine hundred seventy-eight".