816075427 has 4 divisors (see below), whose sum is σ = 820792800. Its totient is φ = 811358056.

The previous prime is 816075409. The next prime is 816075437. The reversal of 816075427 is 724570618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 724570618 = 2 ⋅362285309.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816075427 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 816075427.

It is not an unprimeable number, because it can be changed into a prime (816075437) 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, 2358427 + ... + 2358772.

It is an arithmetic number, because the mean of its divisors is an integer number (205198200).

Almost surely, 2^816075427 is an apocalyptic number.

816075427 is a deficient number, since it is larger than the sum of its proper divisors (4717373).

816075427 is a wasteful number, since it uses less digits than its factorization.

816075427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4717372.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 816075427 is about 28567.0339202375. The cubic root of 816075427 is about 934.4945372463.

The spelling of 816075427 in words is "eight hundred sixteen million, seventy-five thousand, four hundred twenty-seven".