28420715 has 8 divisors (see below), whose sum is σ = 34138800. Its totient is φ = 22713952.

The previous prime is 28420673. The next prime is 28420723. The reversal of 28420715 is 51702482.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28420715 is a prime.

It is a super-2 number, since 2×28420715² = 1615474082222450, which contains 22 as substring.

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, 4361 + ... + 8709.

It is an arithmetic number, because the mean of its divisors is an integer number (4267350).

Almost surely, 2^28420715 is an apocalyptic number.

28420715 is a deficient number, since it is larger than the sum of its proper divisors (5718085).

28420715 is a wasteful number, since it uses less digits than its factorization.

28420715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5661.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 28420715 is about 5331.1082337540. The cubic root of 28420715 is about 305.1722220034.

The spelling of 28420715 in words is "twenty-eight million, four hundred twenty thousand, seven hundred fifteen".