78798440 has 32 divisors (see below), whose sum is σ = 202625280. Its totient is φ = 27016512.

The previous prime is 78798413. The next prime is 78798443. The reversal of 78798440 is 4489787.

It is not an unprimeable number, because it can be changed into a prime (78798443) 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 7 ways as a sum of consecutive naturals, for example, 140432 + ... + 140991.

It is an arithmetic number, because the mean of its divisors is an integer number (6332040).

Almost surely, 2^78798440 is an apocalyptic number.

78798440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78798440 is an abundant number, since it is smaller than the sum of its proper divisors (123826840).

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

78798440 is a wasteful number, since it uses less digits than its factorization.

78798440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281441 (or 281437 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 78798440 is about 8876.8485398817. The cubic root of 78798440 is about 428.7188113209.

The spelling of 78798440 in words is "seventy-eight million, seven hundred ninety-eight thousand, four hundred forty".