28103067661 has 4 divisors (see below), whose sum is σ = 29324940192. Its totient is φ = 26881195132.

The previous prime is 28103067631. The next prime is 28103067673. The reversal of 28103067661 is 16676030182.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28103067661 - 2⁷ = 28103067533 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28103067631) 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, 610936231 + ... + 610936276.

It is an arithmetic number, because the mean of its divisors is an integer number (7331235048).

Almost surely, 2^28103067661 is an apocalyptic number.

It is an amenable number.

28103067661 is a deficient number, since it is larger than the sum of its proper divisors (1221872531).

28103067661 is a wasteful number, since it uses less digits than its factorization.

28103067661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221872530.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 28103067661 in words is "twenty-eight billion, one hundred three million, sixty-seven thousand, six hundred sixty-one".