28375642 has 4 divisors (see below), whose sum is σ = 42563466. Its totient is φ = 14187820.

The previous prime is 28375631. The next prime is 28375663. The reversal of 28375642 is 24657382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24657382 = 2 ⋅12328691.

It can be written as a sum of positive squares in only one way, i.e., 28206721 + 168921 = 5311^2 + 411^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7093909 + ... + 7093912.

Almost surely, 2^28375642 is an apocalyptic number.

28375642 is a deficient number, since it is larger than the sum of its proper divisors (14187824).

28375642 is a wasteful number, since it uses less digits than its factorization.

28375642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14187823.

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

The square root of 28375642 is about 5326.8791989306. The cubic root of 28375642 is about 305.0108103308.

The spelling of 28375642 in words is "twenty-eight million, three hundred seventy-five thousand, six hundred forty-two".