145813820 has 12 divisors (see below), whose sum is σ = 306209064. Its totient is φ = 58325520.

The previous prime is 145813783. The next prime is 145813823. The reversal of 145813820 is 28318541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145813823) 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 3 ways as a sum of consecutive naturals, for example, 3645326 + ... + 3645365.

It is an arithmetic number, because the mean of its divisors is an integer number (25517422).

Almost surely, 2^145813820 is an apocalyptic number.

145813820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145813820 is an abundant number, since it is smaller than the sum of its proper divisors (160395244).

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

145813820 is a wasteful number, since it uses less digits than its factorization.

145813820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7290700 (or 7290698 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 145813820 is about 12075.3393327061. The cubic root of 145813820 is about 526.3398219517.

The spelling of 145813820 in words is "one hundred forty-five million, eight hundred thirteen thousand, eight hundred twenty".