145561988 has 48 divisors (see below), whose sum is σ = 308958720. Its totient is φ = 59097600.

The previous prime is 145561987. The next prime is 145561993. The reversal of 145561988 is 889165541.

It is a happy number.

145561988 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (145561987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13628 + ... + 21836.

It is an arithmetic number, because the mean of its divisors is an integer number (6436640).

Almost surely, 2^145561988 is an apocalyptic number.

It is an amenable number.

145561988 is an abundant number, since it is smaller than the sum of its proper divisors (163396732).

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

145561988 is a wasteful number, since it uses less digits than its factorization.

145561988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8268 (or 8266 counting only the distinct ones).

The product of its digits is 345600, while the sum is 47.

The square root of 145561988 is about 12064.9072934689. The cubic root of 145561988 is about 526.0366371759.

The spelling of 145561988 in words is "one hundred forty-five million, five hundred sixty-one thousand, nine hundred eighty-eight".