864690 has 64 divisors (see below), whose sum is σ = 2298240. Its totient is φ = 207360.

The previous prime is 864679. The next prime is 864691. The reversal of 864690 is 96468.

864690 = T₂₈₄ + T₂₈₅ + ... + T₃₀₃.

864690 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 2×864690² = 1495377592200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864691) 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, 21070 + ... + 21110.

It is an arithmetic number, because the mean of its divisors is an integer number (35910).

2⁸⁶⁴⁶⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 864690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1149120).

864690 is an abundant number, since it is smaller than the sum of its proper divisors (1433550).

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

864690 is a wasteful number, since it uses less digits than its factorization.

864690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 864690 is about 929.8870899201. The cubic root of 864690 is about 95.2694106940.

The spelling of 864690 in words is "eight hundred sixty-four thousand, six hundred ninety".