28401506 has 8 divisors (see below), whose sum is σ = 48688320. Its totient is φ = 12172068.

The previous prime is 28401497. The next prime is 28401511. The reversal of 28401506 is 60510482.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1014326 + ... + 1014353.

It is an arithmetic number, because the mean of its divisors is an integer number (6086040).

Almost surely, 2^28401506 is an apocalyptic number.

28401506 is a deficient number, since it is larger than the sum of its proper divisors (20286814).

28401506 is a wasteful number, since it uses less digits than its factorization.

28401506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028688.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 28401506 is about 5329.3063338487. The cubic root of 28401506 is about 305.1034532152.

Adding to 28401506 its reverse (60510482), we get a palindrome (88911988).

The spelling of 28401506 in words is "twenty-eight million, four hundred one thousand, five hundred six".