145247820 has 48 divisors (see below), whose sum is σ = 411855360. Its totient is φ = 38241216.

The previous prime is 145247777. The next prime is 145247821. The reversal of 145247820 is 28742541.

It is not an unprimeable number, because it can be changed into a prime (145247821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10582 + ... + 20061.

It is an arithmetic number, because the mean of its divisors is an integer number (8580320).

Almost surely, 2^145247820 is an apocalyptic number.

145247820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145247820 is an abundant number, since it is smaller than the sum of its proper divisors (266607540).

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

145247820 is a wasteful number, since it uses less digits than its factorization.

145247820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30734 (or 30732 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 145247820 is about 12051.8803512149. The cubic root of 145247820 is about 525.6579144058.

The spelling of 145247820 in words is "one hundred forty-five million, two hundred forty-seven thousand, eight hundred twenty".