145721636 has 24 divisors (see below), whose sum is σ = 266164920. Its totient is φ = 69719552.

The previous prime is 145721627. The next prime is 145721647. The reversal of 145721636 is 636127541.

It can be written as a sum of positive squares in 4 ways, for example, as 3062500 + 142659136 = 1750^2 + 11944^2 .

It is a junction number, because it is equal to n+sod(n) for n = 145721596 and 145721605.

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, 7550 + ... + 18666.

It is an arithmetic number, because the mean of its divisors is an integer number (11090205).

Almost surely, 2^145721636 is an apocalyptic number.

It is an amenable number.

145721636 is a deficient number, since it is larger than the sum of its proper divisors (120443284).

145721636 is a wasteful number, since it uses less digits than its factorization.

145721636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11263 (or 11261 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 145721636 is about 12071.5216936391. The cubic root of 145721636 is about 526.2288806189.

The spelling of 145721636 in words is "one hundred forty-five million, seven hundred twenty-one thousand, six hundred thirty-six".