816423534 has 24 divisors (see below), whose sum is σ = 1769722032. Its totient is φ = 272017440.

The previous prime is 816423527. The next prime is 816423539. The reversal of 816423534 is 435324618.

816423534 is a `hidden beast` number, since 8 + 1 + 642 + 3 + 5 + 3 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816423539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35994 + ... + 54114.

It is an arithmetic number, because the mean of its divisors is an integer number (73738418).

Almost surely, 2^816423534 is an apocalyptic number.

816423534 is an abundant number, since it is smaller than the sum of its proper divisors (953298498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816423534 is a wasteful number, since it uses less digits than its factorization.

816423534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20632 (or 20629 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 816423534 is about 28573.1260802874. The cubic root of 816423534 is about 934.6273917333.

The spelling of 816423534 in words is "eight hundred sixteen million, four hundred twenty-three thousand, five hundred thirty-four".