28780642 has 16 divisors (see below), whose sum is σ = 47628000. Its totient is φ = 12934240.

The previous prime is 28780639. The next prime is 28780667. The reversal of 28780642 is 24608782.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5392 + ... + 9307.

It is an arithmetic number, because the mean of its divisors is an integer number (2976750).

Almost surely, 2^28780642 is an apocalyptic number.

28780642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28780642 is a deficient number, since it is larger than the sum of its proper divisors (18847358).

28780642 is a wasteful number, since it uses less digits than its factorization.

28780642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14801.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 28780642 is about 5364.7592676652. The cubic root of 28780642 is about 306.4550806294.

The spelling of 28780642 in words is "twenty-eight million, seven hundred eighty thousand, six hundred forty-two".