85978890 has 48 divisors (see below), whose sum is σ = 227224296. Its totient is φ = 22550400.

The previous prime is 85978831. The next prime is 85978961. The reversal of 85978890 is 9887958.

It can be written as a sum of positive squares in 4 ways, for example, as 71622369 + 14356521 = 8463^2 + 3789^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2341 + ... + 13320.

Almost surely, 2^85978890 is an apocalyptic number.

85978890 is an abundant number, since it is smaller than the sum of its proper divisors (141245406).

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

85978890 is a wasteful number, since it uses less digits than its factorization.

85978890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15735 (or 15732 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The square root of 85978890 is about 9272.4802507204. The cubic root of 85978890 is about 441.3643771473.

It can be divided in two parts, 85978 and 890, that added together give a palindrome (86868).

The spelling of 85978890 in words is "eighty-five million, nine hundred seventy-eight thousand, eight hundred ninety".