85478731 has 8 divisors (see below), whose sum is σ = 92161440. Its totient is φ = 78811392.

The previous prime is 85478719. The next prime is 85478779. The reversal of 85478731 is 13787458.

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

It is a cyclic number.

It is not a de Polignac number, because 85478731 - 2⁵ = 85478699 is a prime.

It is a super-2 number, since 2×85478731² = 14613226906740722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85478791) 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, 9435 + ... + 16123.

It is an arithmetic number, because the mean of its divisors is an integer number (11520180).

Almost surely, 2^85478731 is an apocalyptic number.

85478731 is a deficient number, since it is larger than the sum of its proper divisors (6682709).

85478731 is a wasteful number, since it uses less digits than its factorization.

85478731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7685.

The product of its digits is 188160, while the sum is 43.

The square root of 85478731 is about 9245.4708371180. The cubic root of 85478731 is about 440.5068728225.

The spelling of 85478731 in words is "eighty-five million, four hundred seventy-eight thousand, seven hundred thirty-one".