55939978 has 8 divisors (see below), whose sum is σ = 84159972. Its totient is φ = 27886656.

The previous prime is 55939951. The next prime is 55939981. The reversal of 55939978 is 87993955.

55939978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 55845729 + 94249 = 7473^2 + 307^2 .

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

It is a super-2 number, since 2×55939978² = 6258562277280968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40825 + ... + 42172.

Almost surely, 2^55939978 is an apocalyptic number.

55939978 is a deficient number, since it is larger than the sum of its proper divisors (28219994).

55939978 is a wasteful number, since it uses less digits than its factorization.

55939978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83336.

The product of its digits is 3061800, while the sum is 55.

The square root of 55939978 is about 7479.3033098010. The cubic root of 55939978 is about 382.4494996481.

The spelling of 55939978 in words is "fifty-five million, nine hundred thirty-nine thousand, nine hundred seventy-eight".