83221440 has 56 divisors (see below), whose sum is σ = 264231120. Its totient is φ = 22192128.

The previous prime is 83221427. The next prime is 83221451. The reversal of 83221440 is 4412238.

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

It is a self number, because there is not a number n which added to its sum of digits gives 83221440.

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, 42385 + ... + 44304.

Almost surely, 2^83221440 is an apocalyptic number.

83221440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

83221440 is an abundant number, since it is smaller than the sum of its proper divisors (181009680).

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

83221440 is a wasteful number, since it uses less digits than its factorization.

83221440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86709 (or 86699 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 83221440 is about 9122.5785828350. The cubic root of 83221440 is about 436.5946491439.

Adding to 83221440 its reverse (4412238), we get a palindrome (87633678).

The spelling of 83221440 in words is "eighty-three million, two hundred twenty-one thousand, four hundred forty".