28609761 has 8 divisors (see below), whose sum is σ = 38172160. Its totient is φ = 19060272.

The previous prime is 28609751. The next prime is 28609813. The reversal of 28609761 is 16790682.

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

It is not a de Polignac number, because 28609761 - 2⁶ = 28609697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28609751) 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, 4800 + ... + 8958.

It is an arithmetic number, because the mean of its divisors is an integer number (4771520).

Almost surely, 2^28609761 is an apocalyptic number.

It is an amenable number.

28609761 is a deficient number, since it is larger than the sum of its proper divisors (9562399).

28609761 is a wasteful number, since it uses less digits than its factorization.

28609761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6455.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 28609761 is about 5348.8093067523. The cubic root of 28609761 is about 305.8473650324.

It can be divided in two parts, 2860 and 9761, that added together give a palindrome (12621).

The spelling of 28609761 in words is "twenty-eight million, six hundred nine thousand, seven hundred sixty-one".