73661807 has 4 divisors (see below), whose sum is σ = 73822056. Its totient is φ = 73501560.

The previous prime is 73661773. The next prime is 73661813. The reversal of 73661807 is 70816637.

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

It is a cyclic number.

It is not a de Polignac number, because 73661807 - 2¹⁴ = 73645423 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 (73661837) 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, 79433 + ... + 80354.

It is an arithmetic number, because the mean of its divisors is an integer number (18455514).

Almost surely, 2^73661807 is an apocalyptic number.

73661807 is a deficient number, since it is larger than the sum of its proper divisors (160249).

73661807 is a wasteful number, since it uses less digits than its factorization.

73661807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160248.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 73661807 is about 8582.6456876653. The cubic root of 73661807 is about 419.1930974106.

The spelling of 73661807 in words is "seventy-three million, six hundred sixty-one thousand, eight hundred seven".