86815947 has 4 divisors (see below), whose sum is σ = 115754600. Its totient is φ = 57877296.

The previous prime is 86815943. The next prime is 86815951. The reversal of 86815947 is 74951868.

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

It is an interprime number because it is at equal distance from previous prime (86815943) and next prime (86815951).

It is not a de Polignac number, because 86815947 - 2² = 86815943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 86815896 and 86815905.

It is not an unprimeable number, because it can be changed into a prime (86815943) 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, 14469322 + ... + 14469327.

It is an arithmetic number, because the mean of its divisors is an integer number (28938650).

Almost surely, 2^86815947 is an apocalyptic number.

86815947 is a deficient number, since it is larger than the sum of its proper divisors (28938653).

86815947 is a wasteful number, since it uses less digits than its factorization.

86815947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28938652.

The product of its digits is 483840, while the sum is 48.

The square root of 86815947 is about 9317.5075529886. The cubic root of 86815947 is about 442.7920712131.

The spelling of 86815947 in words is "eighty-six million, eight hundred fifteen thousand, nine hundred forty-seven".