27438190978 has 16 divisors (see below), whose sum is σ = 47539967904. Its totient is φ = 11738263360.

The previous prime is 27438190951. The next prime is 27438190991. The reversal of 27438190978 is 87909183472.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36681700 + ... + 36682447.

It is an arithmetic number, because the mean of its divisors is an integer number (2971247994).

Almost surely, 2^27438190978 is an apocalyptic number.

27438190978 is a deficient number, since it is larger than the sum of its proper divisors (20101776926).

27438190978 is a wasteful number, since it uses less digits than its factorization.

27438190978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73364177.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The spelling of 27438190978 in words is "twenty-seven billion, four hundred thirty-eight million, one hundred ninety thousand, nine hundred seventy-eight".