65723449 has 15 divisors (see below), whose sum is σ = 73390485. Its totient is φ = 58856820.

The previous prime is 65723431. The next prime is 65723459. The reversal of 65723449 is 94432756.

It is a happy number.

The square root of 65723449 is 8107.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 65723449 - 2⁷ = 65723321 is a prime.

It is a Duffinian number.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (65723419) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 980914 + ... + 980980.

It is an arithmetic number, because the mean of its divisors is an integer number (4892699).

Almost surely, 2^65723449 is an apocalyptic number.

65723449 is the 8107-th square number.

65723449 is the 4054-th centered octagonal number.

It is an amenable number.

65723449 is a deficient number, since it is larger than the sum of its proper divisors (7667036).

65723449 is an frugal number, since it uses more digits than its factorization.

65723449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 78 counting only the distinct ones).

The product of its digits is 181440, while the sum is 40.

The cubic root of 65723449 is about 403.5587628692.

The spelling of 65723449 in words is "sixty-five million, seven hundred twenty-three thousand, four hundred forty-nine".