28420634 has 16 divisors (see below), whose sum is σ = 49242816. Its totient is φ = 12158400.

The previous prime is 28420633. The next prime is 28420649. The reversal of 28420634 is 43602482.

It is a junction number, because it is equal to n+sod(n) for n = 28420597 and 28420606.

It is not an unprimeable number, because it can be changed into a prime (28420631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37622 + ... + 38369.

It is an arithmetic number, because the mean of its divisors is an integer number (3077676).

Almost surely, 2^28420634 is an apocalyptic number.

28420634 is a deficient number, since it is larger than the sum of its proper divisors (20822182).

28420634 is a wasteful number, since it uses less digits than its factorization.

28420634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76021.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 28420634 is about 5331.1006368291. The cubic root of 28420634 is about 305.1719320861.

The spelling of 28420634 in words is "twenty-eight million, four hundred twenty thousand, six hundred thirty-four".