28219701 has 8 divisors (see below), whose sum is σ = 37857760. Its totient is φ = 18697392.

The previous prime is 28219699. The next prime is 28219717. The reversal of 28219701 is 10791282.

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

It is not a de Polignac number, because 28219701 - 2¹ = 28219699 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28219601) 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, 28366 + ... + 29343.

It is an arithmetic number, because the mean of its divisors is an integer number (4732220).

Almost surely, 2^28219701 is an apocalyptic number.

It is an amenable number.

28219701 is a deficient number, since it is larger than the sum of its proper divisors (9638059).

28219701 is a wasteful number, since it uses less digits than its factorization.

28219701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57875.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 28219701 is about 5312.2218515420. The cubic root of 28219701 is about 304.4510451631.

It can be divided in two parts, 28219 and 701, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 28219701 in words is "twenty-eight million, two hundred nineteen thousand, seven hundred one".