499999999978 has 32 divisors (see below), whose sum is σ = 760909726080. Its totient is φ = 246391934400.

The previous prime is 499999999943. The next prime is 499999999979. The reversal of 499999999978 is 879999999994.

It is not an unprimeable number, because it can be changed into a prime (499999999979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82819576 + ... + 82825612.

It is an arithmetic number, because the mean of its divisors is an integer number (23778428940).

Almost surely, 2^499999999978 is an apocalyptic number.

499999999978 is a deficient number, since it is larger than the sum of its proper divisors (260909726102).

499999999978 is a wasteful number, since it uses less digits than its factorization.

499999999978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8302.

The product of its digits is 86782189536, while the sum is 100.

It can be divided in two parts, 49999999997 and 8, that added together give a palindrome (50000000005).

The spelling of 499999999978 in words is "four hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy-eight".