28207722 has 16 divisors (see below), whose sum is σ = 56710080. Its totient is φ = 9353472.

The previous prime is 28207721. The next prime is 28207733. The reversal of 28207722 is 22770282.

It is a self number, because there is not a number n which added to its sum of digits gives 28207722.

It is not an unprimeable number, because it can be changed into a prime (28207721) 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, 11022 + ... + 13337.

It is an arithmetic number, because the mean of its divisors is an integer number (3544380).

Almost surely, 2^28207722 is an apocalyptic number.

28207722 is an abundant number, since it is smaller than the sum of its proper divisors (28502358).

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

28207722 is a wasteful number, since it uses less digits than its factorization.

28207722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24557.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 28207722 is about 5311.0942375371. The cubic root of 28207722 is about 304.4079601893.

The spelling of 28207722 in words is "twenty-eight million, two hundred seven thousand, seven hundred twenty-two".