28155480 has 32 divisors (see below), whose sum is σ = 84466800. Its totient is φ = 7508096.

The previous prime is 28155469. The next prime is 28155481. The reversal of 28155480 is 8455182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28155481) 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, 117195 + ... + 117434.

Almost surely, 2^28155480 is an apocalyptic number.

28155480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28155480 is an abundant number, since it is smaller than the sum of its proper divisors (56311320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28155480 is a wasteful number, since it uses less digits than its factorization.

28155480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234643 (or 234639 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 28155480 is about 5306.1737627032. The cubic root of 28155480 is about 304.2199182010.

The spelling of 28155480 in words is "twenty-eight million, one hundred fifty-five thousand, four hundred eighty".