77549957 has 4 divisors (see below), whose sum is σ = 78014496. Its totient is φ = 77085420.

The previous prime is 77549939. The next prime is 77549977. The reversal of 77549957 is 75994577.

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: 75994577 = 1669 ⋅45533.

It is a cyclic number.

It is not a de Polignac number, because 77549957 - 2⁶ = 77549893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77549899 and 77549908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77549977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232019 + ... + 232352.

It is an arithmetic number, because the mean of its divisors is an integer number (19503624).

Almost surely, 2^77549957 is an apocalyptic number.

It is an amenable number.

77549957 is a deficient number, since it is larger than the sum of its proper divisors (464539).

77549957 is a wasteful number, since it uses less digits than its factorization.

77549957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464538.

The product of its digits is 2778300, while the sum is 53.

The square root of 77549957 is about 8806.2453406659. The cubic root of 77549957 is about 426.4425390113.

The spelling of 77549957 in words is "seventy-seven million, five hundred forty-nine thousand, nine hundred fifty-seven".