84109780 has 24 divisors (see below), whose sum is σ = 177925608. Its totient is φ = 33397248.

The previous prime is 84109771. The next prime is 84109787. The reversal of 84109780 is 8790148.

It can be written as a sum of positive squares in 4 ways, for example, as 1263376 + 82846404 = 1124^2 + 9102^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84109787) 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, 12609 + ... + 18088.

It is an arithmetic number, because the mean of its divisors is an integer number (7413567).

Almost surely, 2^84109780 is an apocalyptic number.

It is an amenable number.

84109780 is an abundant number, since it is smaller than the sum of its proper divisors (93815828).

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

84109780 is a wasteful number, since it uses less digits than its factorization.

84109780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30843 (or 30841 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 84109780 is about 9171.1384244269. The cubic root of 84109780 is about 438.1426180828.

The spelling of 84109780 in words is "eighty-four million, one hundred nine thousand, seven hundred eighty".