73764661 has 4 divisors (see below), whose sum is σ = 76308300. Its totient is φ = 71221024.

The previous prime is 73764653. The next prime is 73764689. The reversal of 73764661 is 16646737.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16646737 = 2617 ⋅6361.

It can be written as a sum of positive squares in 2 ways, for example, as 17589636 + 56175025 = 4194^2 + 7495^2 .

It is a cyclic number.

It is not a de Polignac number, because 73764661 - 2³ = 73764653 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73764601) 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, 1271776 + ... + 1271833.

It is an arithmetic number, because the mean of its divisors is an integer number (19077075).

Almost surely, 2^73764661 is an apocalyptic number.

It is an amenable number.

73764661 is a deficient number, since it is larger than the sum of its proper divisors (2543639).

73764661 is a wasteful number, since it uses less digits than its factorization.

73764661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543638.

The product of its digits is 127008, while the sum is 40.

The square root of 73764661 is about 8588.6355726623. The cubic root of 73764661 is about 419.3881131484.

The spelling of 73764661 in words is "seventy-three million, seven hundred sixty-four thousand, six hundred sixty-one".