28397070 has 72 divisors (see below), whose sum is σ = 79991496. Its totient is φ = 6986304.

The previous prime is 28397063. The next prime is 28397081. The reversal of 28397070 is 7079382.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14277 + ... + 16143.

It is an arithmetic number, because the mean of its divisors is an integer number (1110993).

Almost surely, 2^28397070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28397070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39995748).

28397070 is an abundant number, since it is smaller than the sum of its proper divisors (51594426).

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

28397070 is a wasteful number, since it uses less digits than its factorization.

28397070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906 (or 1890 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 28397070 is about 5328.8901283476. The cubic root of 28397070 is about 305.0875677972.

The spelling of 28397070 in words is "twenty-eight million, three hundred ninety-seven thousand, seventy".