78389374 has 8 divisors (see below), whose sum is σ = 134381808. Its totient is φ = 33595440.

The previous prime is 78389357. The next prime is 78389401. The reversal of 78389374 is 47398387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78389374² = 12289787912223752, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2799607 + ... + 2799634.

It is an arithmetic number, because the mean of its divisors is an integer number (16797726).

Almost surely, 2^78389374 is an apocalyptic number.

78389374 is a deficient number, since it is larger than the sum of its proper divisors (55992434).

78389374 is a wasteful number, since it uses less digits than its factorization.

78389374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5599250.

The product of its digits is 1016064, while the sum is 49.

The square root of 78389374 is about 8853.7773859523. Note that the first 3 decimals coincide. The cubic root of 78389374 is about 427.9756551501.

The spelling of 78389374 in words is "seventy-eight million, three hundred eighty-nine thousand, three hundred seventy-four".