28737461 has 4 divisors (see below), whose sum is σ = 28749612. Its totient is φ = 28725312.

The previous prime is 28737451. The next prime is 28737479. The reversal of 28737461 is 16473782.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 17380561 + 11356900 = 4169^2 + 3370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28737461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28737421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1250 + ... + 7683.

It is an arithmetic number, because the mean of its divisors is an integer number (7187403).

Almost surely, 2^28737461 is an apocalyptic number.

It is an amenable number.

28737461 is a deficient number, since it is larger than the sum of its proper divisors (12151).

28737461 is an equidigital number, since it uses as much as digits as its factorization.

28737461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12150.

The product of its digits is 56448, while the sum is 38.

The square root of 28737461 is about 5360.7332520841. The cubic root of 28737461 is about 306.3017407512.

The spelling of 28737461 in words is "twenty-eight million, seven hundred thirty-seven thousand, four hundred sixty-one".