77754961 has 4 divisors (see below), whose sum is σ = 78443172. Its totient is φ = 77066752.

The previous prime is 77754959. The next prime is 77754997. The reversal of 77754961 is 16945777.

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 19140625 + 58614336 = 4375^2 + 7656^2 .

It is a cyclic number.

It is not a de Polignac number, because 77754961 - 2¹ = 77754959 is a prime.

It is a super-2 number, since 2×77754961² = 12091667920223042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77704961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343936 + ... + 344161.

It is an arithmetic number, because the mean of its divisors is an integer number (19610793).

Almost surely, 2^77754961 is an apocalyptic number.

It is an amenable number.

77754961 is a deficient number, since it is larger than the sum of its proper divisors (688211).

77754961 is a wasteful number, since it uses less digits than its factorization.

77754961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688210.

The product of its digits is 370440, while the sum is 46.

The square root of 77754961 is about 8817.8773522884. The cubic root of 77754961 is about 426.8179765941.

The spelling of 77754961 in words is "seventy-seven million, seven hundred fifty-four thousand, nine hundred sixty-one".