73645765 has 4 divisors (see below), whose sum is σ = 88374924. Its totient is φ = 58916608.

The previous prime is 73645723. The next prime is 73645777. The reversal of 73645765 is 56754637.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56754637 = 59 ⋅961943.

It can be written as a sum of positive squares in 2 ways, for example, as 44063044 + 29582721 = 6638^2 + 5439^2 .

It is a cyclic number.

It is not a de Polignac number, because 73645765 - 2¹⁵ = 73612997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7364572 + ... + 7364581.

It is an arithmetic number, because the mean of its divisors is an integer number (22093731).

Almost surely, 2^73645765 is an apocalyptic number.

It is an amenable number.

73645765 is a deficient number, since it is larger than the sum of its proper divisors (14729159).

73645765 is a wasteful number, since it uses less digits than its factorization.

73645765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14729158.

The product of its digits is 529200, while the sum is 43.

The square root of 73645765 is about 8581.7110764695. The cubic root of 73645765 is about 419.1626647067.

The spelling of 73645765 in words is "seventy-three million, six hundred forty-five thousand, seven hundred sixty-five".