28735642 has 8 divisors (see below), whose sum is σ = 46419156. Its totient is φ = 13262592.

The previous prime is 28735639. The next prime is 28735649. The reversal of 28735642 is 24653782.

It can be written as a sum of positive squares in 2 ways, for example, as 24890121 + 3845521 = 4989^2 + 1961^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28735649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552583 + ... + 552634.

Almost surely, 2^28735642 is an apocalyptic number.

28735642 is a deficient number, since it is larger than the sum of its proper divisors (17683514).

28735642 is a wasteful number, since it uses less digits than its factorization.

28735642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105232.

The product of its digits is 80640, while the sum is 37.

The square root of 28735642 is about 5360.5635897730. The cubic root of 28735642 is about 306.2952779369.

It can be divided in two parts, 2873 and 5642, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 28735642 in words is "twenty-eight million, seven hundred thirty-five thousand, six hundred forty-two".