28611403957 has 4 divisors (see below), whose sum is σ = 28624288396. Its totient is φ = 28598519520.

The previous prime is 28611403943. The next prime is 28611403969. The reversal of 28611403957 is 75930411682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25921322001 + 2690081956 = 161001^2 + 51866^2 .

It is a cyclic number.

It is not a de Polignac number, because 28611403957 - 2⁷ = 28611403829 is a prime.

It is a super-2 number, since 2×28611403957² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28611403157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6438888 + ... + 6443329.

It is an arithmetic number, because the mean of its divisors is an integer number (7156072099).

It is a 1-persistent number, because it is pandigital, but 2⋅28611403957 = 57222807914 is not.

Almost surely, 2^28611403957 is an apocalyptic number.

It is an amenable number.

28611403957 is a deficient number, since it is larger than the sum of its proper divisors (12884439).

28611403957 is a wasteful number, since it uses less digits than its factorization.

28611403957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12884438.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 28611403957 in words is "twenty-eight billion, six hundred eleven million, four hundred three thousand, nine hundred fifty-seven".