28778734 has 8 divisors (see below), whose sum is σ = 43394688. Its totient is φ = 14313840.

The previous prime is 28778719. The next prime is 28778747. The reversal of 28778734 is 43787782.

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

It is a congruent 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, 37287 + ... + 38050.

It is an arithmetic number, because the mean of its divisors is an integer number (5424336).

Almost surely, 2^28778734 is an apocalyptic number.

28778734 is a deficient number, since it is larger than the sum of its proper divisors (14615954).

28778734 is a wasteful number, since it uses less digits than its factorization.

28778734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75530.

The product of its digits is 526848, while the sum is 46.

The square root of 28778734 is about 5364.5814375401. The cubic root of 28778734 is about 306.4483083782.

It can be divided in two parts, 2877 and 8734, that added together give a palindrome (11611).

The spelling of 28778734 in words is "twenty-eight million, seven hundred seventy-eight thousand, seven hundred thirty-four".