28807758 has 64 divisors (see below), whose sum is σ = 77483520. Its totient is φ = 7744896.

The previous prime is 28807729. The next prime is 28807763. The reversal of 28807758 is 85770882.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4185 + ... + 8667.

It is an arithmetic number, because the mean of its divisors is an integer number (1210680).

Almost surely, 2^28807758 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28807758, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38741760).

28807758 is an abundant number, since it is smaller than the sum of its proper divisors (48675762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28807758 is a wasteful number, since it uses less digits than its factorization.

28807758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4518 (or 4512 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The square root of 28807758 is about 5367.2859063031. The cubic root of 28807758 is about 306.5512937669.

The spelling of 28807758 in words is "twenty-eight million, eight hundred seven thousand, seven hundred fifty-eight".