28133537401 has 4 divisors (see below), whose sum is σ = 28134250852. Its totient is φ = 28132823952.

The previous prime is 28133537387. The next prime is 28133537423. The reversal of 28133537401 is 10473533182.

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 20083141225 + 8050396176 = 141715^2 + 89724^2 .

It is a cyclic number.

It is not a de Polignac number, because 28133537401 - 2⁷ = 28133537273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28133537461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293886 + ... + 377671.

It is an arithmetic number, because the mean of its divisors is an integer number (7033562713).

Almost surely, 2^28133537401 is an apocalyptic number.

It is an amenable number.

28133537401 is a deficient number, since it is larger than the sum of its proper divisors (713451).

28133537401 is an equidigital number, since it uses as much as digits as its factorization.

28133537401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713450.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 28133537401 in words is "twenty-eight billion, one hundred thirty-three million, five hundred thirty-seven thousand, four hundred one".