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83230721 = 7237192
BaseRepresentation
bin1001111011000…
…00000000000001
312210121120002022
410331200000001
5132301340341
612131531225
72030310110
oct475400001
9183546068
1083230721
1142a88522
1223a59b15
1314321a62
14b0a7c77
157490e4b
hex4f60001

83230721 has 12 divisors (see below), whose sum is σ = 99394752. Its totient is φ = 68143944.

The previous prime is 83230717. The next prime is 83230739. The reversal of 83230721 is 12703238.

It is not a de Polignac number, because 83230721 - 22 = 83230717 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83230711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115400 + ... + 116118.

It is an arithmetic number, because the mean of its divisors is an integer number (8282896).

It is a Proth number, since it is equal to 635 ⋅ 217 + 1 and 635 < 217.

Almost surely, 283230721 is an apocalyptic number.

It is an amenable number.

83230721 is a deficient number, since it is larger than the sum of its proper divisors (16164031).

83230721 is an frugal number, since it uses more digits than its factorization.

83230721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468 (or 749 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 83230721 is about 9123.0872515832. The cubic root of 83230721 is about 436.6108784726.

Adding to 83230721 its reverse (12703238), we get a palindrome (95933959).

The spelling of 83230721 in words is "eighty-three million, two hundred thirty thousand, seven hundred twenty-one".

Divisors: 1 7 23 161 719 5033 16537 115759 516961 3618727 11890103 83230721