145491228 has 60 divisors (see below), whose sum is σ = 381976672. Its totient is φ = 48288960.

The previous prime is 145491211. The next prime is 145491233. The reversal of 145491228 is 822194541.

145491228 is a `hidden beast` number, since 145 + 491 + 2 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 145491192 and 145491201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 86976 + ... + 88632.

Almost surely, 2^145491228 is an apocalyptic number.

145491228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 145491228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190988336).

145491228 is an abundant number, since it is smaller than the sum of its proper divisors (236485444).

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

145491228 is a wasteful number, since it uses less digits than its factorization.

145491228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944 (or 1933 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 145491228 is about 12061.9744652358. The cubic root of 145491228 is about 525.9513850986.

The spelling of 145491228 in words is "one hundred forty-five million, four hundred ninety-one thousand, two hundred twenty-eight".