28777642 has 4 divisors (see below), whose sum is σ = 43166466. Its totient is φ = 14388820.

The previous prime is 28777631. The next prime is 28777667. The reversal of 28777642 is 24677782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 26842761 + 1934881 = 5181^2 + 1391^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7194409 + ... + 7194412.

Almost surely, 2^28777642 is an apocalyptic number.

28777642 is a deficient number, since it is larger than the sum of its proper divisors (14388824).

28777642 is a wasteful number, since it uses less digits than its factorization.

28777642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14388823.

The product of its digits is 263424, while the sum is 43.

The square root of 28777642 is about 5364.4796578979. The cubic root of 28777642 is about 306.4444323009. Note that the first 4 decimals are identical.

The spelling of 28777642 in words is "twenty-eight million, seven hundred seventy-seven thousand, six hundred forty-two".