28155479 has 16 divisors (see below), whose sum is σ = 31739904. Its totient is φ = 24753600.

The previous prime is 28155469. The next prime is 28155481. The reversal of 28155479 is 97455182.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28155479 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28155469) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73322 + ... + 73704.

It is an arithmetic number, because the mean of its divisors is an integer number (1983744).

Almost surely, 2^28155479 is an apocalyptic number.

28155479 is a deficient number, since it is larger than the sum of its proper divisors (3584425).

28155479 is a wasteful number, since it uses less digits than its factorization.

28155479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598.

The product of its digits is 100800, while the sum is 41.

The square root of 28155479 is about 5306.1736684734. The cubic root of 28155479 is about 304.2199145993.

The spelling of 28155479 in words is "twenty-eight million, one hundred fifty-five thousand, four hundred seventy-nine".