84821640 has 32 divisors (see below), whose sum is σ = 254465280. Its totient is φ = 22619072.

The previous prime is 84821621. The next prime is 84821651. The reversal of 84821640 is 4612848.

It is a super-2 number, since 2×84821640² = 14389421224579200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353304 + ... + 353543.

It is an arithmetic number, because the mean of its divisors is an integer number (7952040).

Almost surely, 2^84821640 is an apocalyptic number.

It is an amenable number.

84821640 is an abundant number, since it is smaller than the sum of its proper divisors (169643640).

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

84821640 is a wasteful number, since it uses less digits than its factorization.

84821640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706861 (or 706857 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 84821640 is about 9209.8664485431. The cubic root of 84821640 is about 439.3752151754.

The spelling of 84821640 in words is "eighty-four million, eight hundred twenty-one thousand, six hundred forty".