821896790 has 64 divisors (see below), whose sum is σ = 1840345920. Its totient is φ = 259645440.

The previous prime is 821896787. The next prime is 821896819. The reversal of 821896790 is 97698128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7406 + ... + 41214.

It is an arithmetic number, because the mean of its divisors is an integer number (28755405).

Almost surely, 2^821896790 is an apocalyptic number.

821896790 is an abundant number, since it is smaller than the sum of its proper divisors (1018449130).

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

821896790 is a wasteful number, since it uses less digits than its factorization.

821896790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33857.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 821896790 is about 28668.7423860901. The cubic root of 821896790 is about 936.7113044390.

The spelling of 821896790 in words is "eight hundred twenty-one million, eight hundred ninety-six thousand, seven hundred ninety".