28635861 has 8 divisors (see below), whose sum is σ = 38340544. Its totient is φ = 19010880.

The previous prime is 28635853. The next prime is 28635881. The reversal of 28635861 is 16853682.

It is a happy number.

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

It is not a de Polignac number, because 28635861 - 2³ = 28635853 is a prime.

It is a super-2 number, since 2×28635861² = 1640025070422642, which 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 (28635881) 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, 19081 + ... + 20526.

It is an arithmetic number, because the mean of its divisors is an integer number (4792568).

Almost surely, 2^28635861 is an apocalyptic number.

It is an amenable number.

28635861 is a deficient number, since it is larger than the sum of its proper divisors (9704683).

28635861 is a wasteful number, since it uses less digits than its factorization.

28635861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39851.

The product of its digits is 69120, while the sum is 39.

The square root of 28635861 is about 5351.2485459003. The cubic root of 28635861 is about 305.9403425073.

The spelling of 28635861 in words is "twenty-eight million, six hundred thirty-five thousand, eight hundred sixty-one".