823640874 has 32 divisors (see below), whose sum is σ = 1886102016. Its totient is φ = 234889200.

The previous prime is 823640863. The next prime is 823640887. The reversal of 823640874 is 478046328.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5049 + ... + 40899.

It is an arithmetic number, because the mean of its divisors is an integer number (58940688).

Almost surely, 2^823640874 is an apocalyptic number.

823640874 is an abundant number, since it is smaller than the sum of its proper divisors (1062461142).

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

823640874 is a wasteful number, since it uses less digits than its factorization.

823640874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36410.

The product of its (nonzero) digits is 258048, while the sum is 42.

The square root of 823640874 is about 28699.1441335800. The cubic root of 823640874 is about 937.3734106765.

The spelling of 823640874 in words is "eight hundred twenty-three million, six hundred forty thousand, eight hundred seventy-four".