145731620 has 24 divisors (see below), whose sum is σ = 315909888. Its totient is φ = 56412000.

The previous prime is 145731571. The next prime is 145731629. The reversal of 145731620 is 26137541.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (145731629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116906 + ... + 118145.

It is an arithmetic number, because the mean of its divisors is an integer number (13162912).

Almost surely, 2^145731620 is an apocalyptic number.

145731620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145731620 is an abundant number, since it is smaller than the sum of its proper divisors (170178268).

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

145731620 is a wasteful number, since it uses less digits than its factorization.

145731620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235091 (or 235089 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 145731620 is about 12071.9352218275. The cubic root of 145731620 is about 526.2408983931.

The spelling of 145731620 in words is "one hundred forty-five million, seven hundred thirty-one thousand, six hundred twenty".