42728615 has 8 divisors (see below), whose sum is σ = 51364368. Its totient is φ = 34122880.

The previous prime is 42728603. The next prime is 42728617. The reversal of 42728615 is 51682724.

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

It is not a de Polignac number, because 42728615 - 2¹⁴ = 42712231 is a prime.

It is a super-3 number, since 3×42728615³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42728617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4241 + ... + 10170.

It is an arithmetic number, because the mean of its divisors is an integer number (6420546).

Almost surely, 2^42728615 is an apocalyptic number.

42728615 is a deficient number, since it is larger than the sum of its proper divisors (8635753).

42728615 is a wasteful number, since it uses less digits than its factorization.

42728615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15009.

The product of its digits is 26880, while the sum is 35.

The square root of 42728615 is about 6536.7128589223. The cubic root of 42728615 is about 349.6012192818.

The spelling of 42728615 in words is "forty-two million, seven hundred twenty-eight thousand, six hundred fifteen".