7940499978 has 32 divisors (see below), whose sum is σ = 16819954560. Its totient is φ = 2490429440.

The previous prime is 7940499977. The next prime is 7940500019. The reversal of 7940499978 is 8799940497.

It is not an unprimeable number, because it can be changed into a prime (7940499977) 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, 439018 + ... + 456746.

It is an arithmetic number, because the mean of its divisors is an integer number (525623580).

Almost surely, 2^7940499978 is an apocalyptic number.

7940499978 is an abundant number, since it is smaller than the sum of its proper divisors (8879454582).

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

7940499978 is a wasteful number, since it uses less digits than its factorization.

7940499978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22142.

The product of its (nonzero) digits is 41150592, while the sum is 66.

The square root of 7940499978 is about 89109.4830980407. The cubic root of 7940499978 is about 1995.0293212442.

The spelling of 7940499978 in words is "seven billion, nine hundred forty million, four hundred ninety-nine thousand, nine hundred seventy-eight".