84784220 has 12 divisors (see below), whose sum is σ = 178046904. Its totient is φ = 33913680.

The previous prime is 84784211. The next prime is 84784229. The reversal of 84784220 is 2248748.

It is an interprime number because it is at equal distance from previous prime (84784211) and next prime (84784229).

It is a super-2 number, since 2×84784220² = 14376727922016800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84784229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2119586 + ... + 2119625.

It is an arithmetic number, because the mean of its divisors is an integer number (14837242).

Almost surely, 2^84784220 is an apocalyptic number.

It is an amenable number.

84784220 is an abundant number, since it is smaller than the sum of its proper divisors (93262684).

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

84784220 is a wasteful number, since it uses less digits than its factorization.

84784220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4239220 (or 4239218 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 84784220 is about 9207.8347074652. The cubic root of 84784220 is about 439.3105939344.

The spelling of 84784220 in words is "eighty-four million, seven hundred eighty-four thousand, two hundred twenty".