83721020 has 24 divisors (see below), whose sum is σ = 175996800. Its totient is φ = 33453632.

The previous prime is 83721019. The next prime is 83721023. The reversal of 83721020 is 2012738.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83721023) 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, 27326 + ... + 30234.

It is an arithmetic number, because the mean of its divisors is an integer number (7333200).

Almost surely, 2^83721020 is an apocalyptic number.

It is an amenable number.

83721020 is an abundant number, since it is smaller than the sum of its proper divisors (92275780).

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

83721020 is a wasteful number, since it uses less digits than its factorization.

83721020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4357 (or 4355 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 83721020 is about 9149.9191253256. The cubic root of 83721020 is about 437.4665356717.

Adding to 83721020 its reverse (2012738), we get a palindrome (85733758).

The spelling of 83721020 in words is "eighty-three million, seven hundred twenty-one thousand, twenty".