728525894134537 has 2 divisors, whose sum is σ = 728525894134538. Its totient is φ = 728525894134536.

The previous prime is 728525894134487. The next prime is 728525894134541. The reversal of 728525894134537 is 735431498525827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 633707065784521 + 94818828350016 = 25173539^2 + 9737496^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728525894134537 is a prime.

It is a super-2 number, since 2×728525894134537² (a number of 31 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 728525894134537.

It is not a weakly prime, because it can be changed into another prime (728525894134037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364262947067268 + 364262947067269.

It is an arithmetic number, because the mean of its divisors is an integer number (364262947067269).

Almost surely, 2^{728525894134537} is an apocalyptic number.

It is an amenable number.

728525894134537 is a deficient number, since it is larger than the sum of its proper divisors (1).

728525894134537 is an equidigital number, since it uses as much as digits as its factorization.

728525894134537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128000, while the sum is 73.

The spelling of 728525894134537 in words is "seven hundred twenty-eight trillion, five hundred twenty-five billion, eight hundred ninety-four million, one hundred thirty-four thousand, five hundred thirty-seven".