28621442 has 4 divisors (see below), whose sum is σ = 42932166. Its totient is φ = 14310720.

The previous prime is 28621427. The next prime is 28621447. The reversal of 28621442 is 24412682.

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., 19971961 + 8649481 = 4469^2 + 2941^2 .

It is not an unprimeable number, because it can be changed into a prime (28621447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7155359 + ... + 7155362.

Almost surely, 2^28621442 is an apocalyptic number.

28621442 is a deficient number, since it is larger than the sum of its proper divisors (14310724).

28621442 is a wasteful number, since it uses less digits than its factorization.

28621442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14310723.

The product of its digits is 6144, while the sum is 29.

The square root of 28621442 is about 5349.9011205816. The cubic root of 28621442 is about 305.8889838930. Note that the first 3 decimals are identical.

The spelling of 28621442 in words is "twenty-eight million, six hundred twenty-one thousand, four hundred forty-two".