78570870 has 64 divisors (see below), whose sum is σ = 217161216. Its totient is φ = 17821440.

The previous prime is 78570859. The next prime is 78570907. The reversal of 78570870 is 7807587.

It is a super-2 number, since 2×78570870² = 12346763225113800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27405 + ... + 30135.

It is an arithmetic number, because the mean of its divisors is an integer number (3393144).

Almost surely, 2^78570870 is an apocalyptic number.

78570870 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78570870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108580608).

78570870 is an abundant number, since it is smaller than the sum of its proper divisors (138590346).

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

78570870 is a wasteful number, since it uses less digits than its factorization.

78570870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885.

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

The square root of 78570870 is about 8864.0210965453. The cubic root of 78570870 is about 428.3056998765.

The spelling of 78570870 in words is "seventy-eight million, five hundred seventy thousand, eight hundred seventy".