15428565 has 24 divisors (see below), whose sum is σ = 27251640. Its totient is φ = 8072064.

The previous prime is 15428563. The next prime is 15428573. The reversal of 15428565 is 56582451.

It can be written as a sum of positive squares in 4 ways, for example, as 381924 + 15046641 = 618^2 + 3879^2 .

It is not a de Polignac number, because 15428565 - 2¹ = 15428563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15428563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 850 + ... + 5619.

It is an arithmetic number, because the mean of its divisors is an integer number (1135485).

Almost surely, 2^15428565 is an apocalyptic number.

15428565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15428565 is a deficient number, since it is larger than the sum of its proper divisors (11823075).

15428565 is a wasteful number, since it uses less digits than its factorization.

15428565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6533 (or 6530 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 15428565 is about 3927.9212059307. The cubic root of 15428565 is about 248.9479254338.

It can be divided in two parts, 1542 and 8565, that multiplied together give a triangular number (13207230 = T₅₁₃₉).

The spelling of 15428565 in words is "fifteen million, four hundred twenty-eight thousand, five hundred sixty-five".