870690 has 16 divisors (see below), whose sum is σ = 2089728. Its totient is φ = 232176.

The previous prime is 870679. The next prime is 870691. The reversal of 870690 is 96078.

It is a happy number.

It is a super-2 number, since 2×870690² = 1516202152200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 29023 = 870690 / (8 + 7 + 0 + 6 + 9 + 0).

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (870691) by changing a digit.

870690 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14482 + ... + 14541.

It is an arithmetic number, because the mean of its divisors is an integer number (130608).

2⁸⁷⁰⁶⁹⁰ is an apocalyptic number.

870690 is an abundant number, since it is smaller than the sum of its proper divisors (1219038).

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

870690 is a wasteful number, since it uses less digits than its factorization.

870690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29033.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 870690 is about 933.1077108244. The cubic root of 870690 is about 95.4892580409.

The spelling of 870690 in words is "eight hundred seventy thousand, six hundred ninety".