78243974 has 16 divisors (see below), whose sum is σ = 120820848. Its totient is φ = 37975392.

The previous prime is 78243967. The next prime is 78244021. The reversal of 78243974 is 47934287.

It is a super-2 number, since 2×78243974² = 12244238934625352, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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, 39512 + ... + 41444.

It is an arithmetic number, because the mean of its divisors is an integer number (7551303).

Almost surely, 2^78243974 is an apocalyptic number.

78243974 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

78243974 is a deficient number, since it is larger than the sum of its proper divisors (42576874).

78243974 is a wasteful number, since it uses less digits than its factorization.

78243974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2519.

The product of its digits is 338688, while the sum is 44.

The square root of 78243974 is about 8845.5623902610. The cubic root of 78243974 is about 427.7108821289.

The spelling of 78243974 in words is "seventy-eight million, two hundred forty-three thousand, nine hundred seventy-four".