78093438 has 16 divisors (see below), whose sum is σ = 159996816. Its totient is φ = 25396160.

The previous prime is 78093437. The next prime is 78093451. The reversal of 78093438 is 83439087.

It is a self number, because there is not a number n which added to its sum of digits gives 78093438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78093437) 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, 158481 + ... + 158972.

It is an arithmetic number, because the mean of its divisors is an integer number (9999801).

Almost surely, 2^78093438 is an apocalyptic number.

78093438 is an abundant number, since it is smaller than the sum of its proper divisors (81903378).

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

78093438 is a wasteful number, since it uses less digits than its factorization.

78093438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317499.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 78093438 is about 8837.0491681330. The cubic root of 78093438 is about 427.4364106368.

The spelling of 78093438 in words is "seventy-eight million, ninety-three thousand, four hundred thirty-eight".