145721724 has 24 divisors (see below), whose sum is σ = 344677200. Its totient is φ = 47908224.

The previous prime is 145721701. The next prime is 145721729. The reversal of 145721724 is 427127541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145721729) 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, 82299 + ... + 84050.

It is an arithmetic number, because the mean of its divisors is an integer number (14361550).

Almost surely, 2^145721724 is an apocalyptic number.

It is an amenable number.

145721724 is an abundant number, since it is smaller than the sum of its proper divisors (198955476).

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

145721724 is a wasteful number, since it uses less digits than its factorization.

145721724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166429 (or 166427 counting only the distinct ones).

The product of its digits is 15680, while the sum is 33.

The square root of 145721724 is about 12071.5253385809. The cubic root of 145721724 is about 526.2289865472.

The spelling of 145721724 in words is "one hundred forty-five million, seven hundred twenty-one thousand, seven hundred twenty-four".