28061951 has 4 divisors (see below), whose sum is σ = 29712672. Its totient is φ = 26411232.

The previous prime is 28061923. The next prime is 28061959. The reversal of 28061951 is 15916082.

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

It is a cyclic number.

It is not a de Polignac number, because 28061951 - 2²² = 23867647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28061959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825335 + ... + 825368.

It is an arithmetic number, because the mean of its divisors is an integer number (7428168).

Almost surely, 2^28061951 is an apocalyptic number.

28061951 is a deficient number, since it is larger than the sum of its proper divisors (1650721).

28061951 is a wasteful number, since it uses less digits than its factorization.

28061951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650720.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 28061951 is about 5297.3532070271. The cubic root of 28061951 is about 303.8826842746.

The spelling of 28061951 in words is "twenty-eight million, sixty-one thousand, nine hundred fifty-one".