7287640837 has 2 divisors, whose sum is σ = 7287640838. Its totient is φ = 7287640836.

The previous prime is 7287640831. The next prime is 7287640847. The reversal of 7287640837 is 7380467827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6169474116 + 1118166721 = 78546^2 + 33439^2 .

It is a cyclic number.

It is not a de Polignac number, because 7287640837 - 2¹¹ = 7287638789 is a prime.

It is a super-2 number, since 2×7287640837² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7287640831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3643820418 + 3643820419.

It is an arithmetic number, because the mean of its divisors is an integer number (3643820419).

Almost surely, 2^7287640837 is an apocalyptic number.

It is an amenable number.

7287640837 is a deficient number, since it is larger than the sum of its proper divisors (1).

7287640837 is an equidigital number, since it uses as much as digits as its factorization.

7287640837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3161088, while the sum is 52.

The square root of 7287640837 is about 85367.6802835827. The cubic root of 7287640837 is about 1938.7820353915.

The spelling of 7287640837 in words is "seven billion, two hundred eighty-seven million, six hundred forty thousand, eight hundred thirty-seven".