145091890 has 32 divisors (see below), whose sum is σ = 268240896. Its totient is φ = 56474880.

The previous prime is 145091861. The next prime is 145091909. The reversal of 145091890 is 98190541.

145091890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164250 + ... + 165130.

It is an arithmetic number, because the mean of its divisors is an integer number (8382528).

Almost surely, 2^145091890 is an apocalyptic number.

145091890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

145091890 is a deficient number, since it is larger than the sum of its proper divisors (123149006).

145091890 is a wasteful number, since it uses less digits than its factorization.

145091890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 145091890 is about 12045.4094990581. The cubic root of 145091890 is about 525.4697413293.

The spelling of 145091890 in words is "one hundred forty-five million, ninety-one thousand, eight hundred ninety".