28742870 has 32 divisors (see below), whose sum is σ = 58145472. Its totient is φ = 10150272.

The previous prime is 28742867. The next prime is 28742873. The reversal of 28742870 is 7824782.

It is an interprime number because it is at equal distance from previous prime (28742867) and next prime (28742873).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28742873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1817 + ... + 7796.

It is an arithmetic number, because the mean of its divisors is an integer number (1817046).

Almost surely, 2^28742870 is an apocalyptic number.

28742870 is an abundant number, since it is smaller than the sum of its proper divisors (29402602).

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

28742870 is a wasteful number, since it uses less digits than its factorization.

28742870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9656.

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 28742870 is about 5361.2377302261. The cubic root of 28742870 is about 306.3209570415.

The spelling of 28742870 in words is "twenty-eight million, seven hundred forty-two thousand, eight hundred seventy".