28212742 has 4 divisors (see below), whose sum is σ = 42319116. Its totient is φ = 14106370.

The previous prime is 28212731. The next prime is 28212749. The reversal of 28212742 is 24721282.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×28212742² = 1591917622317128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28212742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28212749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7053184 + ... + 7053187.

It is an arithmetic number, because the mean of its divisors is an integer number (10579779).

Almost surely, 2^28212742 is an apocalyptic number.

28212742 is a deficient number, since it is larger than the sum of its proper divisors (14106374).

28212742 is a wasteful number, since it uses less digits than its factorization.

28212742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14106373.

The product of its digits is 3584, while the sum is 28.

The square root of 28212742 is about 5311.5668121563. The cubic root of 28212742 is about 304.4260171516.

The spelling of 28212742 in words is "twenty-eight million, two hundred twelve thousand, seven hundred forty-two".