78293390 has 32 divisors (see below), whose sum is σ = 162639360. Its totient is φ = 26580384.

The previous prime is 78293353. The next prime is 78293393. The reversal of 78293390 is 9339287.

It is a super-2 number, since 2×78293390² = 12259709835384200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) 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 not an unprimeable number, because it can be changed into a prime (78293393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1781 + ... + 12639.

It is an arithmetic number, because the mean of its divisors is an integer number (5082480).

Almost surely, 2^78293390 is an apocalyptic number.

78293390 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78293390 is an abundant number, since it is smaller than the sum of its proper divisors (84345970).

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

78293390 is a wasteful number, since it uses less digits than its factorization.

78293390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10976.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 78293390 is about 8848.3552143887. The cubic root of 78293390 is about 427.8009053043.

The spelling of 78293390 in words is "seventy-eight million, two hundred ninety-three thousand, three hundred ninety".