28219770 has 24 divisors (see below), whose sum is σ = 73371636. Its totient is φ = 7525248.

The previous prime is 28219757. The next prime is 28219783. The reversal of 28219770 is 7791282.

It is an interprime number because it is at equal distance from previous prime (28219757) and next prime (28219783).

It can be written as a sum of positive squares in 2 ways, for example, as 27468081 + 751689 = 5241^2 + 867^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156687 + ... + 156866.

Almost surely, 2^28219770 is an apocalyptic number.

28219770 is an abundant number, since it is smaller than the sum of its proper divisors (45151866).

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

28219770 is a wasteful number, since it uses less digits than its factorization.

28219770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313566 (or 313563 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 28219770 is about 5312.2283459957. The cubic root of 28219770 is about 304.4512933007.

The spelling of 28219770 in words is "twenty-eight million, two hundred nineteen thousand, seven hundred seventy".