77485561 has 4 divisors (see below), whose sum is σ = 78237952. Its totient is φ = 76733172.

The previous prime is 77485559. The next prime is 77485601. The reversal of 77485561 is 16558477.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16558477 = 13 ⋅1273729.

It is a cyclic number.

It is not a de Polignac number, because 77485561 - 2¹ = 77485559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77485861) 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, 376041 + ... + 376246.

It is an arithmetic number, because the mean of its divisors is an integer number (19559488).

Almost surely, 2^77485561 is an apocalyptic number.

It is an amenable number.

77485561 is a deficient number, since it is larger than the sum of its proper divisors (752391).

77485561 is a wasteful number, since it uses less digits than its factorization.

77485561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752390.

The product of its digits is 235200, while the sum is 43.

The square root of 77485561 is about 8802.5883125363. The cubic root of 77485561 is about 426.3244697503.

The spelling of 77485561 in words is "seventy-seven million, four hundred eighty-five thousand, five hundred sixty-one".