28637434 has 16 divisors (see below), whose sum is σ = 50291136. Its totient is φ = 11973600.

The previous prime is 28637431. The next prime is 28637443. The reversal of 28637434 is 43473682.

It is a happy number.

It is a super-2 number, since 2×28637434² = 1640205252208712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28637393 and 28637402.

It is not an unprimeable number, because it can be changed into a prime (28637431) 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, 24372 + ... + 25519.

It is an arithmetic number, because the mean of its divisors is an integer number (3143196).

Almost surely, 2^28637434 is an apocalyptic number.

28637434 is a deficient number, since it is larger than the sum of its proper divisors (21653702).

28637434 is a wasteful number, since it uses less digits than its factorization.

28637434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49941.

The product of its digits is 96768, while the sum is 37.

The square root of 28637434 is about 5351.3955189277. The cubic root of 28637434 is about 305.9459442869.

The spelling of 28637434 in words is "twenty-eight million, six hundred thirty-seven thousand, four hundred thirty-four".