28981701 has 36 divisors (see below), whose sum is σ = 49640032. Its totient is φ = 15960672.

The previous prime is 28981697. The next prime is 28981709. The reversal of 28981701 is 10718982.

It is not a de Polignac number, because 28981701 - 2² = 28981697 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 (28981709) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 52710 + ... + 53256.

Almost surely, 2^28981701 is an apocalyptic number.

28981701 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28981701 is a deficient number, since it is larger than the sum of its proper divisors (20658331).

28981701 is a wasteful number, since it uses less digits than its factorization.

28981701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618 (or 586 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 28981701 is about 5383.4655195329. The cubic root of 28981701 is about 307.1670479080.

The spelling of 28981701 in words is "twenty-eight million, nine hundred eighty-one thousand, seven hundred one".