145299744 has 120 divisors (see below), whose sum is σ = 442286460. Its totient is φ = 46738944.

The previous prime is 145299733. The next prime is 145299757. The reversal of 145299744 is 447992541.

It can be written as a sum of positive squares in 2 ways, for example, as 143712144 + 1587600 = 11988^2 + 1260^2 .

It is a super-2 number, since 2×145299744² = 42224031212931072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145299744.

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, 74202 + ... + 76134.

Almost surely, 2^145299744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 145299744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221143230).

145299744 is an abundant number, since it is smaller than the sum of its proper divisors (296986716).

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

145299744 is a wasteful number, since it uses less digits than its factorization.

145299744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984 (or 1967 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 145299744 is about 12054.0343453966. The cubic root of 145299744 is about 525.7205453166.

The spelling of 145299744 in words is "one hundred forty-five million, two hundred ninety-nine thousand, seven hundred forty-four".