73440641 has 4 divisors (see below), whose sum is σ = 74325552. Its totient is φ = 72555732.

The previous prime is 73440623. The next prime is 73440659. The reversal of 73440641 is 14604437.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14604437 = 61 ⋅239417.

It is an interprime number because it is at equal distance from previous prime (73440623) and next prime (73440659).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73440641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73440611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442331 + ... + 442496.

It is an arithmetic number, because the mean of its divisors is an integer number (18581388).

Almost surely, 2^73440641 is an apocalyptic number.

It is an amenable number.

73440641 is a deficient number, since it is larger than the sum of its proper divisors (884911).

73440641 is an equidigital number, since it uses as much as digits as its factorization.

73440641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884910.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 73440641 is about 8569.7515133171. The cubic root of 73440641 is about 418.7731411879.

The spelling of 73440641 in words is "seventy-three million, four hundred forty thousand, six hundred forty-one".