28401923 has 8 divisors (see below), whose sum is σ = 31062576. Its totient is φ = 25754400.

The previous prime is 28401911. The next prime is 28401931. The reversal of 28401923 is 32910482.

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-28401923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28401223) 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, 1565 + ... + 7697.

It is an arithmetic number, because the mean of its divisors is an integer number (3882822).

Almost surely, 2^28401923 is an apocalyptic number.

28401923 is a deficient number, since it is larger than the sum of its proper divisors (2660653).

28401923 is a wasteful number, since it uses less digits than its factorization.

28401923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6565.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 28401923 is about 5329.3454569956. The cubic root of 28401923 is about 305.1049464168.

The spelling of 28401923 in words is "twenty-eight million, four hundred one thousand, nine hundred twenty-three".