28640910 has 16 divisors (see below), whose sum is σ = 68738256. Its totient is φ = 7637568.

The previous prime is 28640863. The next prime is 28640917. The reversal of 28640910 is 1904682.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 954697 = 28640910 / (2 + 8 + 6 + 4 + 0 + 9 + 1 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28640917) 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, 477319 + ... + 477378.

It is an arithmetic number, because the mean of its divisors is an integer number (4296141).

Almost surely, 2^28640910 is an apocalyptic number.

28640910 is an abundant number, since it is smaller than the sum of its proper divisors (40097346).

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

28640910 is a wasteful number, since it uses less digits than its factorization.

28640910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954707.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 28640910 is about 5351.7202841703. The cubic root of 28640910 is about 305.9583223172.

The spelling of 28640910 in words is "twenty-eight million, six hundred forty thousand, nine hundred ten".