77296561 has 8 divisors (see below), whose sum is σ = 78537384. Its totient is φ = 76060800.

The previous prime is 77296559. The next prime is 77296567. The reversal of 77296561 is 16569277.

It can be written as a sum of positive squares in 4 ways, for example, as 295936 + 77000625 = 544^2 + 8775^2 .

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 77296561 - 2¹ = 77296559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77296567) 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, 39711 + ... + 41611.

It is an arithmetic number, because the mean of its divisors is an integer number (9817173).

Almost surely, 2^77296561 is an apocalyptic number.

It is an amenable number.

77296561 is a deficient number, since it is larger than the sum of its proper divisors (1240823).

77296561 is a wasteful number, since it uses less digits than its factorization.

77296561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2531.

The product of its digits is 158760, while the sum is 43.

The square root of 77296561 is about 8791.8462793659. The cubic root of 77296561 is about 425.9775624263.

The spelling of 77296561 in words is "seventy-seven million, two hundred ninety-six thousand, five hundred sixty-one".