78085731 has 8 divisors (see below), whose sum is σ = 104405760. Its totient is φ = 51911432.

The previous prime is 78085727. The next prime is 78085739. The reversal of 78085731 is 13758087.

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 78085731 - 2² = 78085727 is a prime.

It is a super-2 number, since 2×78085731² = 12194762771608722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78085731.

It is not an unprimeable number, because it can be changed into a prime (78085739) 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, 35175 + ... + 37328.

It is an arithmetic number, because the mean of its divisors is an integer number (13050720).

Almost surely, 2^78085731 is an apocalyptic number.

78085731 is a deficient number, since it is larger than the sum of its proper divisors (26320029).

78085731 is a wasteful number, since it uses less digits than its factorization.

78085731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72865.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 78085731 is about 8836.6130955248. The cubic root of 78085731 is about 427.4223490166.

The spelling of 78085731 in words is "seventy-eight million, eighty-five thousand, seven hundred thirty-one".