85921690 has 8 divisors (see below), whose sum is σ = 154659060. Its totient is φ = 34368672.

The previous prime is 85921681. The next prime is 85921699. The reversal of 85921690 is 9612958.

It is an interprime number because it is at equal distance from previous prime (85921681) and next prime (85921699).

It can be written as a sum of positive squares in 2 ways, for example, as 84474481 + 1447209 = 9191^2 + 1203^2 .

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

It is a super-2 number, since 2×85921690² = 14765073624912200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (85921699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4296075 + ... + 4296094.

Almost surely, 2^85921690 is an apocalyptic number.

85921690 is a deficient number, since it is larger than the sum of its proper divisors (68737370).

85921690 is a wasteful number, since it uses less digits than its factorization.

85921690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8592176.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 85921690 is about 9269.3953416606. The cubic root of 85921690 is about 441.2664785314.

The spelling of 85921690 in words is "eighty-five million, nine hundred twenty-one thousand, six hundred ninety".