28770638 has 8 divisors (see below), whose sum is σ = 46475688. Its totient is φ = 13278744.

The previous prime is 28770611. The next prime is 28770649. The reversal of 28770638 is 83607782.

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

It is a super-2 number, since 2×28770638² = 1655499221854088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28770595 and 28770604.

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, 553256 + ... + 553307.

It is an arithmetic number, because the mean of its divisors is an integer number (5809461).

Almost surely, 2^28770638 is an apocalyptic number.

28770638 is a deficient number, since it is larger than the sum of its proper divisors (17705050).

28770638 is a wasteful number, since it uses less digits than its factorization.

28770638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106578.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 28770638 is about 5363.8268055559. The cubic root of 28770638 is about 306.4195691224.

The spelling of 28770638 in words is "twenty-eight million, seven hundred seventy thousand, six hundred thirty-eight".