83021520 has 40 divisors (see below), whose sum is σ = 257367456. Its totient is φ = 22139008.

The previous prime is 83021501. The next prime is 83021531. The reversal of 83021520 is 2512038.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×83021520² = 13785145566220800, which contains 22 as substring.

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, 172722 + ... + 173201.

Almost surely, 2^83021520 is an apocalyptic number.

83021520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

83021520 is an abundant number, since it is smaller than the sum of its proper divisors (174345936).

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

83021520 is a wasteful number, since it uses less digits than its factorization.

83021520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345939 (or 345933 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 83021520 is about 9111.6145660360. The cubic root of 83021520 is about 436.2447633901.

Adding to 83021520 its reverse (2512038), we get a palindrome (85533558).

The spelling of 83021520 in words is "eighty-three million, twenty-one thousand, five hundred twenty".