145747540 has 24 divisors (see below), whose sum is σ = 306610920. Its totient is φ = 58195968.

The previous prime is 145747531. The next prime is 145747543. The reversal of 145747540 is 45747541.

It can be written as a sum of positive squares in 4 ways, for example, as 39162564 + 106584976 = 6258^2 + 10324^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 145747540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145747543) 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, 5716 + ... + 18004.

It is an arithmetic number, because the mean of its divisors is an integer number (12775455).

Almost surely, 2^145747540 is an apocalyptic number.

145747540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145747540 is an abundant number, since it is smaller than the sum of its proper divisors (160863380).

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

145747540 is a wasteful number, since it uses less digits than its factorization.

145747540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12891 (or 12889 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 37.

The square root of 145747540 is about 12072.5945844296. The cubic root of 145747540 is about 526.2600602151.

Subtracting from 145747540 its reverse (45747541), we obtain a palindrome (99999999).

The spelling of 145747540 in words is "one hundred forty-five million, seven hundred forty-seven thousand, five hundred forty".