73378661 has 4 divisors (see below), whose sum is σ = 73401900. Its totient is φ = 73355424.

The previous prime is 73378607. The next prime is 73378673. The reversal of 73378661 is 16687337.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44809636 + 28569025 = 6694^2 + 5345^2 .

It is a cyclic number.

It is not a de Polignac number, because 73378661 - 2¹⁴ = 73362277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73378061) 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, 5966 + ... + 13503.

It is an arithmetic number, because the mean of its divisors is an integer number (18350475).

Almost surely, 2^73378661 is an apocalyptic number.

It is an amenable number.

73378661 is a deficient number, since it is larger than the sum of its proper divisors (23239).

73378661 is a wasteful number, since it uses less digits than its factorization.

73378661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23238.

The product of its digits is 127008, while the sum is 41.

The square root of 73378661 is about 8566.1345424876. The cubic root of 73378661 is about 418.6553006023.

The spelling of 73378661 in words is "seventy-three million, three hundred seventy-eight thousand, six hundred sixty-one".