28290620 has 24 divisors (see below), whose sum is σ = 62538000. Its totient is φ = 10720512.

The previous prime is 28290599. The next prime is 28290643. The reversal of 28290620 is 2609282.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36845 + ... + 37604.

It is an arithmetic number, because the mean of its divisors is an integer number (2605750).

Almost surely, 2^28290620 is an apocalyptic number.

28290620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28290620 is an abundant number, since it is smaller than the sum of its proper divisors (34247380).

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

28290620 is a wasteful number, since it uses less digits than its factorization.

28290620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74477 (or 74475 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 28290620 is about 5318.8927419154. The cubic root of 28290620 is about 304.7058707047.

The spelling of 28290620 in words is "twenty-eight million, two hundred ninety thousand, six hundred twenty".