78473840 has 40 divisors (see below), whose sum is σ = 183790320. Its totient is φ = 31159296.

The previous prime is 78473833. The next prime is 78473851. The reversal of 78473840 is 4837487.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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, 7592 + ... + 14648.

It is an arithmetic number, because the mean of its divisors is an integer number (4594758).

Almost surely, 2^78473840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78473840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91895160).

78473840 is an abundant number, since it is smaller than the sum of its proper divisors (105316480).

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

78473840 is a wasteful number, since it uses less digits than its factorization.

78473840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7209 (or 7203 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 41.

The square root of 78473840 is about 8858.5461561139. The cubic root of 78473840 is about 428.1293171994.

The spelling of 78473840 in words is "seventy-eight million, four hundred seventy-three thousand, eight hundred forty".