145720944 has 100 divisors (see below), whose sum is σ = 424463160. Its totient is φ = 48263040.

The previous prime is 145720931. The next prime is 145720961. The reversal of 145720944 is 449027541.

It is a happy number.

It is a super-2 number, since 2×145720944² = 42469187040502272, which contains 22 as substring.

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 = 145720899 and 145720908.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 296539 + ... + 297029.

Almost surely, 2^145720944 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 145720944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212231580).

145720944 is an abundant number, since it is smaller than the sum of its proper divisors (278742216).

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

145720944 is a wasteful number, since it uses less digits than its factorization.

145720944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740 (or 725 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 145720944 is about 12071.4930311043. The cubic root of 145720944 is about 526.2280476359.

The spelling of 145720944 in words is "one hundred forty-five million, seven hundred twenty thousand, nine hundred forty-four".