28711534 has 4 divisors (see below), whose sum is σ = 43067304. Its totient is φ = 14355766.

The previous prime is 28711517. The next prime is 28711547. The reversal of 28711534 is 43511782.

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

It is a super-5 number, since 5×28711534⁵ (a number of 38 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28711496 and 28711505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7177882 + ... + 7177885.

It is an arithmetic number, because the mean of its divisors is an integer number (10766826).

Almost surely, 2^28711534 is an apocalyptic number.

28711534 is a deficient number, since it is larger than the sum of its proper divisors (14355770).

28711534 is a wasteful number, since it uses less digits than its factorization.

28711534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14355769.

The product of its digits is 6720, while the sum is 31.

The square root of 28711534 is about 5358.3144737874. The cubic root of 28711534 is about 306.2095976689.

The spelling of 28711534 in words is "twenty-eight million, seven hundred eleven thousand, five hundred thirty-four".