84742780 has 24 divisors (see below), whose sum is σ = 180400752. Its totient is φ = 33432192.

The previous prime is 84742771. The next prime is 84742811. The reversal of 84742780 is 8724748.

It is a happy number.

It is a congruent number.

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, 27562 + ... + 30481.

It is an arithmetic number, because the mean of its divisors is an integer number (7516698).

Almost surely, 2^84742780 is an apocalyptic number.

It is an amenable number.

84742780 is an abundant number, since it is smaller than the sum of its proper divisors (95657972).

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

84742780 is a wasteful number, since it uses less digits than its factorization.

84742780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58125 (or 58123 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 40.

The square root of 84742780 is about 9205.5841748365. The cubic root of 84742780 is about 439.2390082948.

The spelling of 84742780 in words is "eighty-four million, seven hundred forty-two thousand, seven hundred eighty".