28961943457 has 2 divisors, whose sum is σ = 28961943458. Its totient is φ = 28961943456.

The previous prime is 28961943449. The next prime is 28961943469. The reversal of 28961943457 is 75434916982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18257144161 + 10704799296 = 135119^2 + 103464^2 .

It is a cyclic number.

It is not a de Polignac number, because 28961943457 - 2³ = 28961943449 is a prime.

It is a super-2 number, since 2×28961943457² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28961941457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14480971728 + 14480971729.

It is an arithmetic number, because the mean of its divisors is an integer number (14480971729).

Almost surely, 2^28961943457 is an apocalyptic number.

It is an amenable number.

28961943457 is a deficient number, since it is larger than the sum of its proper divisors (1).

28961943457 is an equidigital number, since it uses as much as digits as its factorization.

28961943457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 58.

The spelling of 28961943457 in words is "twenty-eight billion, nine hundred sixty-one million, nine hundred forty-three thousand, four hundred fifty-seven".