28615505 has 8 divisors (see below), whose sum is σ = 36358632. Its totient is φ = 21545728.

The previous prime is 28615493. The next prime is 28615529. The reversal of 28615505 is 50551682.

It can be written as a sum of positive squares in 4 ways, for example, as 2062096 + 26553409 = 1436^2 + 5153^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28615505 - 2¹² = 28611409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168242 + ... + 168411.

It is an arithmetic number, because the mean of its divisors is an integer number (4544829).

Almost surely, 2^28615505 is an apocalyptic number.

It is an amenable number.

28615505 is a deficient number, since it is larger than the sum of its proper divisors (7743127).

28615505 is a wasteful number, since it uses less digits than its factorization.

28615505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336675.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 28615505 is about 5349.3462217359. The cubic root of 28615505 is about 305.8678320530.

The spelling of 28615505 in words is "twenty-eight million, six hundred fifteen thousand, five hundred five".