78057870 has 64 divisors (see below), whose sum is σ = 208272384. Its totient is φ = 18561920.

The previous prime is 78057853. The next prime is 78057877. The reversal of 78057870 is 7875087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78057877) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15259 + ... + 19721.

It is an arithmetic number, because the mean of its divisors is an integer number (3254256).

Almost surely, 2^78057870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78057870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104136192).

78057870 is an abundant number, since it is smaller than the sum of its proper divisors (130214514).

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

78057870 is a wasteful number, since it uses less digits than its factorization.

78057870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4537.

The product of its (nonzero) digits is 109760, while the sum is 42.

The square root of 78057870 is about 8835.0365024713. The cubic root of 78057870 is about 427.3715081844.

The spelling of 78057870 in words is "seventy-eight million, fifty-seven thousand, eight hundred seventy".