781086870 has 96 divisors (see below), whose sum is σ = 2116951200. Its totient is φ = 199567872.

The previous prime is 781086853. The next prime is 781086893. The reversal of 781086870 is 78680187.

781086870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×781086870² = 1220193396972793800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 361714 + ... + 363866.

It is an arithmetic number, because the mean of its divisors is an integer number (22051575).

Almost surely, 2^781086870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 781086870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1058475600).

781086870 is an abundant number, since it is smaller than the sum of its proper divisors (1335864330).

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

781086870 is a wasteful number, since it uses less digits than its factorization.

781086870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334 (or 2331 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The square root of 781086870 is about 27947.9314082456. The cubic root of 781086870 is about 920.9437660849.

The spelling of 781086870 in words is "seven hundred eighty-one million, eighty-six thousand, eight hundred seventy".