28913951 has 4 divisors (see below), whose sum is σ = 31542504. Its totient is φ = 26285400.

The previous prime is 28913947. The next prime is 28913959. The reversal of 28913951 is 15931982.

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 28913951 - 2² = 28913947 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 (28913959) 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, 1314260 + ... + 1314281.

It is an arithmetic number, because the mean of its divisors is an integer number (7885626).

Almost surely, 2^28913951 is an apocalyptic number.

28913951 is a deficient number, since it is larger than the sum of its proper divisors (2628553).

28913951 is a wasteful number, since it uses less digits than its factorization.

28913951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628552.

The product of its digits is 19440, while the sum is 38.

The square root of 28913951 is about 5377.1694226610. The cubic root of 28913951 is about 306.9275081980.

The spelling of 28913951 in words is "twenty-eight million, nine hundred thirteen thousand, nine hundred fifty-one".