85651978 has 8 divisors (see below), whose sum is σ = 129296772. Its totient is φ = 42553056.

The previous prime is 85651963. The next prime is 85652027. The reversal of 85651978 is 87915658.

It can be written as a sum of positive squares in 2 ways, for example, as 72641529 + 13010449 = 8523^2 + 3607^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×85651978² = 14672522670624968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136075 + ... + 136702.

Almost surely, 2^85651978 is an apocalyptic number.

85651978 is a deficient number, since it is larger than the sum of its proper divisors (43644794).

85651978 is a wasteful number, since it uses less digits than its factorization.

85651978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272936.

The product of its digits is 604800, while the sum is 49.

The square root of 85651978 is about 9254.8353848137. The cubic root of 85651978 is about 440.8042762125.

The spelling of 85651978 in words is "eighty-five million, six hundred fifty-one thousand, nine hundred seventy-eight".