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72821011 is a prime number
BaseRepresentation
bin1000101011100…
…10100100010011
312002000200122111
410111302210103
5122120233021
611120450151
71542653104
oct425624423
9162020574
1072821011
113811855a
1220479957
1312118873
1499583ab
1565d68e1
hex4572913

72821011 has 2 divisors, whose sum is σ = 72821012. Its totient is φ = 72821010.

The previous prime is 72820999. The next prime is 72821041. The reversal of 72821011 is 11012827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72821011 - 29 = 72820499 is a prime.

It is not a weakly prime, because it can be changed into another prime (72821041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36410505 + 36410506.

It is an arithmetic number, because the mean of its divisors is an integer number (36410506).

Almost surely, 272821011 is an apocalyptic number.

72821011 is a deficient number, since it is larger than the sum of its proper divisors (1).

72821011 is an equidigital number, since it uses as much as digits as its factorization.

72821011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 72821011 is about 8533.5227778450. The cubic root of 72821011 is about 417.5920621200.

Adding to 72821011 its reverse (11012827), we get a palindrome (83833838).

The spelling of 72821011 in words is "seventy-two million, eight hundred twenty-one thousand, eleven".