78379994 has 16 divisors (see below), whose sum is σ = 146581056. Its totient is φ = 30537600.

The previous prime is 78379993. The next prime is 78380009. The reversal of 78379994 is 49997387.

It is a super-2 number, since 2×78379994² = 12286846918880072, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78379991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254327 + ... + 254634.

It is an arithmetic number, because the mean of its divisors is an integer number (9161316).

Almost surely, 2^78379994 is an apocalyptic number.

78379994 is a deficient number, since it is larger than the sum of its proper divisors (68201062).

78379994 is a wasteful number, since it uses less digits than its factorization.

78379994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508981.

The product of its digits is 3429216, while the sum is 56.

The square root of 78379994 is about 8853.2476526979. The cubic root of 78379994 is about 427.9585840788.

The spelling of 78379994 in words is "seventy-eight million, three hundred seventy-nine thousand, nine hundred ninety-four".