77520734057 has 8 divisors (see below), whose sum is σ = 83486046336. Its totient is φ = 71555733072.

The previous prime is 77520734021. The next prime is 77520734063. The reversal of 77520734057 is 75043702577.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77520734057 - 2¹⁸ = 77520471913 is a prime.

It is a super-2 number, since 2×77520734057² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77520734857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 842978 + ... + 930404.

It is an arithmetic number, because the mean of its divisors is an integer number (10435755792).

Almost surely, 2^77520734057 is an apocalyptic number.

It is an amenable number.

77520734057 is a deficient number, since it is larger than the sum of its proper divisors (5965312279).

77520734057 is a wasteful number, since it uses less digits than its factorization.

77520734057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155647.

The product of its (nonzero) digits is 1440600, while the sum is 47.

The spelling of 77520734057 in words is "seventy-seven billion, five hundred twenty million, seven hundred thirty-four thousand, fifty-seven".