73509977 has 4 divisors (see below), whose sum is σ = 73680180. Its totient is φ = 73339776.

The previous prime is 73509937. The next prime is 73509991. The reversal of 73509977 is 77990537.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77990537 = 139 ⋅561083.

It can be written as a sum of positive squares in 2 ways, for example, as 48219136 + 25290841 = 6944^2 + 5029^2 .

It is a cyclic number.

It is not a de Polignac number, because 73509977 - 2⁶ = 73509913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73509907) 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, 84452 + ... + 85317.

It is an arithmetic number, because the mean of its divisors is an integer number (18420045).

Almost surely, 2^73509977 is an apocalyptic number.

It is an amenable number.

73509977 is a deficient number, since it is larger than the sum of its proper divisors (170203).

73509977 is a wasteful number, since it uses less digits than its factorization.

73509977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170202.

The product of its (nonzero) digits is 416745, while the sum is 47.

The square root of 73509977 is about 8573.7959504528. The cubic root of 73509977 is about 418.9048889558.

The spelling of 73509977 in words is "seventy-three million, five hundred nine thousand, nine hundred seventy-seven".