870978 has 16 divisors (see below), whose sum is σ = 1844640. Its totient is φ = 273216.

The previous prime is 870977. The next prime is 870983. The reversal of 870978 is 879078.

It is not an unprimeable number, because it can be changed into a prime (870977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4168 + ... + 4371.

It is an arithmetic number, because the mean of its divisors is an integer number (115290).

2⁸⁷⁰⁹⁷⁸ is an apocalyptic number.

870978 is an abundant number, since it is smaller than the sum of its proper divisors (973662).

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

870978 is a wasteful number, since it uses less digits than its factorization.

870978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8561.

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 870978 is about 933.2620210852. The cubic root of 870978 is about 95.4997852759.

Subtracting 870978 from its reverse (879078), we obtain a square (8100 = 90²).

It can be divided in two parts, 870 and 978, that multiplied together give a triangular number (850860 = T₁₃₀₄).

The spelling of 870978 in words is "eight hundred seventy thousand, nine hundred seventy-eight".