145431720 has 128 divisors (see below), whose sum is σ = 554054400. Its totient is φ = 33239808.

The previous prime is 145431709. The next prime is 145431743. The reversal of 145431720 is 27134541.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2059 + ... + 17178.

It is an arithmetic number, because the mean of its divisors is an integer number (4328550).

Almost surely, 2^145431720 is an apocalyptic number.

145431720 is a gapful number since it is divisible by the number (10) 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 145431720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277027200).

145431720 is an abundant number, since it is smaller than the sum of its proper divisors (408622680).

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

145431720 is a wasteful number, since it uses less digits than its factorization.

145431720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19264 (or 19254 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 145431720 is about 12059.5074526284. The cubic root of 145431720 is about 525.8796680988.

The spelling of 145431720 in words is "one hundred forty-five million, four hundred thirty-one thousand, seven hundred twenty".