28750661 has 8 divisors (see below), whose sum is σ = 29036544. Its totient is φ = 28466640.

The previous prime is 28750651. The next prime is 28750663. The reversal of 28750661 is 16605782.

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 28750661 - 2⁶ = 28750597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28750663) 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, 74876 + ... + 75258.

It is an arithmetic number, because the mean of its divisors is an integer number (3629568).

Almost surely, 2^28750661 is an apocalyptic number.

It is an amenable number.

28750661 is a deficient number, since it is larger than the sum of its proper divisors (285883).

28750661 is a wasteful number, since it uses less digits than its factorization.

28750661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 28750661 is about 5361.9642855953. The cubic root of 28750661 is about 306.3486315103.

The spelling of 28750661 in words is "twenty-eight million, seven hundred fifty thousand, six hundred sixty-one".