15428709 has 12 divisors (see below), whose sum is σ = 22361196. Its totient is φ = 10251072.

The previous prime is 15428687. The next prime is 15428713. The reversal of 15428709 is 90782451.

It can be written as a sum of positive squares in 2 ways, for example, as 8122500 + 7306209 = 2850^2 + 2703^2 .

It is not a de Polignac number, because 15428709 - 2⁸ = 15428453 is a prime.

It is a super-2 number, since 2×15428709² = 476090122813362, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15428729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79 + ... + 5555.

It is an arithmetic number, because the mean of its divisors is an integer number (1863433).

Almost surely, 2^15428709 is an apocalyptic number.

It is an amenable number.

15428709 is a deficient number, since it is larger than the sum of its proper divisors (6932487).

15428709 is a wasteful number, since it uses less digits than its factorization.

15428709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5796 (or 5793 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 15428709 is about 3927.9395361945. The cubic root of 15428709 is about 248.9486999363.

The spelling of 15428709 in words is "fifteen million, four hundred twenty-eight thousand, seven hundred nine".