85378731 has 4 divisors (see below), whose sum is σ = 113838312. Its totient is φ = 56919152.

The previous prime is 85378729. The next prime is 85378747. The reversal of 85378731 is 13787358.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85378731 - 2¹ = 85378729 is a prime.

It is a super-2 number, since 2×85378731² = 14579055414340722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (85378751) 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, 14229786 + ... + 14229791.

It is an arithmetic number, because the mean of its divisors is an integer number (28459578).

Almost surely, 2^85378731 is an apocalyptic number.

85378731 is a deficient number, since it is larger than the sum of its proper divisors (28459581).

85378731 is a wasteful number, since it uses less digits than its factorization.

85378731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28459580.

The product of its digits is 141120, while the sum is 42.

The square root of 85378731 is about 9240.0612010960. The cubic root of 85378731 is about 440.3350254870.

The spelling of 85378731 in words is "eighty-five million, three hundred seventy-eight thousand, seven hundred thirty-one".