28772274 has 32 divisors (see below), whose sum is σ = 58947840. Its totient is φ = 9360000.

The previous prime is 28772257. The next prime is 28772299. The reversal of 28772274 is 47227782.

It is a happy number.

It is a super-2 number, since 2×28772274² = 1655687502262152, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47574 + ... + 48174.

It is an arithmetic number, because the mean of its divisors is an integer number (1842120).

Almost surely, 2^28772274 is an apocalyptic number.

28772274 is an abundant number, since it is smaller than the sum of its proper divisors (30175566).

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

28772274 is a wasteful number, since it uses less digits than its factorization.

28772274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786.

The product of its digits is 87808, while the sum is 39.

The square root of 28772274 is about 5363.9793064478. The cubic root of 28772274 is about 306.4253770449.

It can be divided in two parts, 2877 and 2274, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 28772274 in words is "twenty-eight million, seven hundred seventy-two thousand, two hundred seventy-four".