83420784 has 30 divisors (see below), whose sum is σ = 233462736. Its totient is φ = 27806880.

The previous prime is 83420767. The next prime is 83420789. The reversal of 83420784 is 48702438.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83420789) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 289512 + ... + 289799.

Almost surely, 2^83420784 is an apocalyptic number.

It is an amenable number.

83420784 is an abundant number, since it is smaller than the sum of its proper divisors (150041952).

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

83420784 is a wasteful number, since it uses less digits than its factorization.

83420784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579325 (or 579316 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 83420784 is about 9133.4979060599. The cubic root of 83420784 is about 436.9429693409.

The spelling of 83420784 in words is "eighty-three million, four hundred twenty thousand, seven hundred eighty-four".