78440346 has 32 divisors (see below), whose sum is σ = 184567680. Its totient is φ = 24608448.

The previous prime is 78440291. The next prime is 78440357. The reversal of 78440346 is 64304487.

It is a self number, because there is not a number n which added to its sum of digits gives 78440346.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41806 + ... + 43641.

It is an arithmetic number, because the mean of its divisors is an integer number (5767740).

Almost surely, 2^78440346 is an apocalyptic number.

78440346 is an abundant number, since it is smaller than the sum of its proper divisors (106127334).

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

78440346 is a wasteful number, since it uses less digits than its factorization.

78440346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85475 (or 85469 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 78440346 is about 8856.6554635483. The cubic root of 78440346 is about 428.0683975181.

The spelling of 78440346 in words is "seventy-eight million, four hundred forty thousand, three hundred forty-six".