145779220 has 24 divisors (see below), whose sum is σ = 307193544. Its totient is φ = 58110336.

The previous prime is 145779197. The next prime is 145779247. The reversal of 145779220 is 22977541.

It can be written as a sum of positive squares in 4 ways, for example, as 7387524 + 138391696 = 2718^2 + 11764^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 145779220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6579 + ... + 18298.

It is an arithmetic number, because the mean of its divisors is an integer number (12799731).

Almost surely, 2^145779220 is an apocalyptic number.

145779220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145779220 is an abundant number, since it is smaller than the sum of its proper divisors (161414324).

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

145779220 is a wasteful number, since it uses less digits than its factorization.

145779220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25179 (or 25177 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 145779220 is about 12073.9065757525. The cubic root of 145779220 is about 526.2981871271.

The spelling of 145779220 in words is "one hundred forty-five million, seven hundred seventy-nine thousand, two hundred twenty".