77628761416 has 8 divisors (see below), whose sum is σ = 145553927670. Its totient is φ = 38814380704.

The previous prime is 77628761317. The next prime is 77628761437. The reversal of 77628761416 is 61416782677.

It can be written as a sum of positive squares in only one way, i.e., 76865344516 + 763416900 = 277246^2 + 27630^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4851797581 + ... + 4851797596.

Almost surely, 2^77628761416 is an apocalyptic number.

It is an amenable number.

77628761416 is a deficient number, since it is larger than the sum of its proper divisors (67925166254).

77628761416 is a wasteful number, since it uses less digits than its factorization.

77628761416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9703595183 (or 9703595179 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 55.

The spelling of 77628761416 in words is "seventy-seven billion, six hundred twenty-eight million, seven hundred sixty-one thousand, four hundred sixteen".