28420534 has 4 divisors (see below), whose sum is σ = 42630804. Its totient is φ = 14210266.

The previous prime is 28420531. The next prime is 28420537. The reversal of 28420534 is 43502482.

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

It is an interprime number because it is at equal distance from previous prime (28420531) and next prime (28420537).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28420531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7105132 + ... + 7105135.

It is an arithmetic number, because the mean of its divisors is an integer number (10657701).

Almost surely, 2^28420534 is an apocalyptic number.

28420534 is a deficient number, since it is larger than the sum of its proper divisors (14210270).

28420534 is a wasteful number, since it uses less digits than its factorization.

28420534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14210269.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 28420534 is about 5331.0912578946. The cubic root of 28420534 is about 305.1715741627.

The spelling of 28420534 in words is "twenty-eight million, four hundred twenty thousand, five hundred thirty-four".