28135357649 has 16 divisors (see below), whose sum is σ = 32910810240. Its totient is φ = 23549218560.

The previous prime is 28135357633. The next prime is 28135357669. The reversal of 28135357649 is 94675353182.

It is a happy number.

It is not a de Polignac number, because 28135357649 - 2⁴ = 28135357633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28135357649.

It is not an unprimeable number, because it can be changed into a prime (28135357609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1498379 + ... + 1517039.

It is an arithmetic number, because the mean of its divisors is an integer number (2056925640).

Almost surely, 2^28135357649 is an apocalyptic number.

It is an amenable number.

28135357649 is a deficient number, since it is larger than the sum of its proper divisors (4775452591).

28135357649 is a wasteful number, since it uses less digits than its factorization.

28135357649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23720.

The product of its digits is 5443200, while the sum is 53.

The spelling of 28135357649 in words is "twenty-eight billion, one hundred thirty-five million, three hundred fifty-seven thousand, six hundred forty-nine".