83521320 has 64 divisors (see below), whose sum is σ = 251277120. Its totient is φ = 22209024.

The previous prime is 83521307. The next prime is 83521337. The reversal of 83521320 is 2312538.

It is a Cunningham number, because it is equal to 9139²-1.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54079 + ... + 55601.

It is an arithmetic number, because the mean of its divisors is an integer number (3926205).

Almost surely, 2^83521320 is an apocalyptic number.

It is an amenable number.

83521320 is an abundant number, since it is smaller than the sum of its proper divisors (167755800).

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

83521320 is a wasteful number, since it uses less digits than its factorization.

83521320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1994 (or 1990 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 83521320 is about 9138.9999452894. Note that the first 4 decimals coincide. The cubic root of 83521320 is about 437.1184286649.

Adding to 83521320 its reverse (2312538), we get a palindrome (85833858).

It can be divided in two parts, 835 and 21320, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 83521320 in words is "eighty-three million, five hundred twenty-one thousand, three hundred twenty".