28921061 has 8 divisors (see below), whose sum is σ = 31449600. Its totient is φ = 26435952.

The previous prime is 28921037. The next prime is 28921073. The reversal of 28921061 is 16012982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28921061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28921261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9461 + ... + 12138.

It is an arithmetic number, because the mean of its divisors is an integer number (3931200).

Almost surely, 2^28921061 is an apocalyptic number.

It is an amenable number.

28921061 is a deficient number, since it is larger than the sum of its proper divisors (2528539).

28921061 is a wasteful number, since it uses less digits than its factorization.

28921061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21715.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 28921061 is about 5377.8305105312. The cubic root of 28921061 is about 306.9526641713.

The spelling of 28921061 in words is "twenty-eight million, nine hundred twenty-one thousand, sixty-one".