145781658 has 48 divisors (see below), whose sum is σ = 346765536. Its totient is φ = 43895520.

The previous prime is 145781651. The next prime is 145781677. The reversal of 145781658 is 856187541.

145781658 is a `hidden beast` number, since 14 + 578 + 1 + 65 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145781651) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 30016 + ... + 34532.

It is an arithmetic number, because the mean of its divisors is an integer number (7224282).

Almost surely, 2^145781658 is an apocalyptic number.

145781658 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 145781658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173382768).

145781658 is an abundant number, since it is smaller than the sum of its proper divisors (200983878).

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

145781658 is a wasteful number, since it uses less digits than its factorization.

145781658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4699 (or 4696 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 145781658 is about 12074.0075368537. The cubic root of 145781658 is about 526.3011210336.

The spelling of 145781658 in words is "one hundred forty-five million, seven hundred eighty-one thousand, six hundred fifty-eight".