28655347661 has 8 divisors (see below), whose sum is σ = 29232058464. Its totient is φ = 28079971920.

The previous prime is 28655347621. The next prime is 28655347697. The reversal of 28655347661 is 16674355682.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28655347661 - 2¹⁴ = 28655331277 is a prime.

It is a super-2 number, since 2×28655347661² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28655347621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290351 + ... + 376316.

It is an arithmetic number, because the mean of its divisors is an integer number (3654007308).

Almost surely, 2^28655347661 is an apocalyptic number.

It is an amenable number.

28655347661 is a deficient number, since it is larger than the sum of its proper divisors (576710803).

28655347661 is an equidigital number, since it uses as much as digits as its factorization.

28655347661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667531.

The product of its digits is 7257600, while the sum is 53.

The spelling of 28655347661 in words is "twenty-eight billion, six hundred fifty-five million, three hundred forty-seven thousand, six hundred sixty-one".