145641690 has 24 divisors (see below), whose sum is σ = 378668628. Its totient is φ = 38837760.

The previous prime is 145641653. The next prime is 145641701. The reversal of 145641690 is 96146541.

145641690 is a `hidden beast` number, since 1 + 4 + 5 + 641 + 6 + 9 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 117094041 + 28547649 = 10821^2 + 5343^2 .

It is a super-2 number, since 2×145641690² = 42423003732112200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

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 11 ways as a sum of consecutive naturals, for example, 809031 + ... + 809210.

Almost surely, 2^145641690 is an apocalyptic number.

145641690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

145641690 is an abundant number, since it is smaller than the sum of its proper divisors (233026938).

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

145641690 is a wasteful number, since it uses less digits than its factorization.

145641690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618254 (or 1618251 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 145641690 is about 12068.2098921091. The cubic root of 145641690 is about 526.1326295495.

The spelling of 145641690 in words is "one hundred forty-five million, six hundred forty-one thousand, six hundred ninety".