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72479861 is a prime number
BaseRepresentation
bin1000101000111…
…11010001110101
312001101100200022
410110133101311
5122023323421
611105254525
71540032356
oct424372165
9161340608
1072479861
1137a05213
1220334445
13120294bc
1498a9d2d
15656a7ab
hex451f475

72479861 has 2 divisors, whose sum is σ = 72479862. Its totient is φ = 72479860.

The previous prime is 72479839. The next prime is 72479867. The reversal of 72479861 is 16897427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37136836 + 35343025 = 6094^2 + 5945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-72479861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72479867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36239930 + 36239931.

It is an arithmetic number, because the mean of its divisors is an integer number (36239931).

Almost surely, 272479861 is an apocalyptic number.

It is an amenable number.

72479861 is a deficient number, since it is larger than the sum of its proper divisors (1).

72479861 is an equidigital number, since it uses as much as digits as its factorization.

72479861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 44.

The square root of 72479861 is about 8513.5104980261. The cubic root of 72479861 is about 416.9389329496.

The spelling of 72479861 in words is "seventy-two million, four hundred seventy-nine thousand, eight hundred sixty-one".