77550073 has 4 divisors (see below), whose sum is σ = 82111860. Its totient is φ = 72988288.

The previous prime is 77550059. The next prime is 77550091. The reversal of 77550073 is 37005577.

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 25522704 + 52027369 = 5052^2 + 7213^2 .

It is a cyclic number.

It is not a de Polignac number, because 77550073 - 2⁵ = 77550041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77550023) 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, 2280868 + ... + 2280901.

It is an arithmetic number, because the mean of its divisors is an integer number (20527965).

Almost surely, 2^77550073 is an apocalyptic number.

It is an amenable number.

77550073 is a deficient number, since it is larger than the sum of its proper divisors (4561787).

77550073 is a wasteful number, since it uses less digits than its factorization.

77550073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4561786.

The product of its (nonzero) digits is 25725, while the sum is 34.

The square root of 77550073 is about 8806.2519268983. The cubic root of 77550073 is about 426.4427516368.

The spelling of 77550073 in words is "seventy-seven million, five hundred fifty thousand, seventy-three".