84421780 has 24 divisors (see below), whose sum is σ = 177458400. Its totient is φ = 33735840.

The previous prime is 84421741. The next prime is 84421781. The reversal of 84421780 is 8712448.

It is a super-3 number, since 3×84421780³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84421781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39171 + ... + 41269.

It is an arithmetic number, because the mean of its divisors is an integer number (7394100).

Almost surely, 2^84421780 is an apocalyptic number.

It is an amenable number.

84421780 is an abundant number, since it is smaller than the sum of its proper divisors (93036620).

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

84421780 is a wasteful number, since it uses less digits than its factorization.

84421780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4119 (or 4117 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 84421780 is about 9188.1325632579. The cubic root of 84421780 is about 438.6837038598.

The spelling of 84421780 in words is "eighty-four million, four hundred twenty-one thousand, seven hundred eighty".