77422561 has 4 divisors (see below), whose sum is σ = 77483824. Its totient is φ = 77361300.

The previous prime is 77422523. The next prime is 77422567. The reversal of 77422561 is 16522477.

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: 16522477 = 1327 ⋅12451.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77422561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77422567) 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, 28695 + ... + 31276.

It is an arithmetic number, because the mean of its divisors is an integer number (19370956).

Almost surely, 2^77422561 is an apocalyptic number.

It is an amenable number.

77422561 is a deficient number, since it is larger than the sum of its proper divisors (61263).

77422561 is a wasteful number, since it uses less digits than its factorization.

77422561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61262.

The product of its digits is 23520, while the sum is 34.

The square root of 77422561 is about 8799.0090919376. The cubic root of 77422561 is about 426.2088967168.

The spelling of 77422561 in words is "seventy-seven million, four hundred twenty-two thousand, five hundred sixty-one".