145091688 has 32 divisors (see below), whose sum is σ = 414548160. Its totient is φ = 41454720.

The previous prime is 145091677. The next prime is 145091693. The reversal of 145091688 is 886190541.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431653 + ... + 431988.

It is an arithmetic number, because the mean of its divisors is an integer number (12954630).

Almost surely, 2^145091688 is an apocalyptic number.

It is an amenable number.

145091688 is an abundant number, since it is smaller than the sum of its proper divisors (269456472).

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

145091688 is a wasteful number, since it uses less digits than its factorization.

145091688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863657 (or 863653 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 145091688 is about 12045.4011141182. The cubic root of 145091688 is about 525.4694974725.

The spelling of 145091688 in words is "one hundred forty-five million, ninety-one thousand, six hundred eighty-eight".