816257427 has 4 divisors (see below), whose sum is σ = 1088343240. Its totient is φ = 544171616.

The previous prime is 816257411. The next prime is 816257437. The reversal of 816257427 is 724752618.

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 816257427 - 2⁴ = 816257411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816257437) 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, 136042902 + ... + 136042907.

It is an arithmetic number, because the mean of its divisors is an integer number (272085810).

Almost surely, 2^816257427 is an apocalyptic number.

816257427 is a deficient number, since it is larger than the sum of its proper divisors (272085813).

816257427 is a wasteful number, since it uses less digits than its factorization.

816257427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272085812.

The product of its digits is 188160, while the sum is 42.

The square root of 816257427 is about 28570.2192326205. The cubic root of 816257427 is about 934.5640019707.

The spelling of 816257427 in words is "eight hundred sixteen million, two hundred fifty-seven thousand, four hundred twenty-seven".