78855040 has 128 divisors (see below), whose sum is σ = 215032320. Its totient is φ = 27371520.

The previous prime is 78855037. The next prime is 78855059. The reversal of 78855040 is 4055887.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

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, 161677 + ... + 162163.

It is an arithmetic number, because the mean of its divisors is an integer number (1679940).

Almost surely, 2^78855040 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 78855040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107516160).

78855040 is an abundant number, since it is smaller than the sum of its proper divisors (136177280).

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

78855040 is a wasteful number, since it uses less digits than its factorization.

78855040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 78855040 is about 8880.0360359629. The cubic root of 78855040 is about 428.8214346603.

The spelling of 78855040 in words is "seventy-eight million, eight hundred fifty-five thousand, forty".