28220522 has 8 divisors (see below), whose sum is σ = 46179072. Its totient is φ = 12827500.

The previous prime is 28220519. The next prime is 28220551. The reversal of 28220522 is 22502282.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641354 + ... + 641397.

It is an arithmetic number, because the mean of its divisors is an integer number (5772384).

Almost surely, 2^28220522 is an apocalyptic number.

28220522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28220522 is a deficient number, since it is larger than the sum of its proper divisors (17958550).

28220522 is a wasteful number, since it uses less digits than its factorization.

28220522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282764.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 28220522 is about 5312.2991256141. The cubic root of 28220522 is about 304.4539976144.

The spelling of 28220522 in words is "twenty-eight million, two hundred twenty thousand, five hundred twenty-two".