77146378640 has 40 divisors (see below), whose sum is σ = 179407475520. Its totient is φ = 30851300736.

The previous prime is 77146378619. The next prime is 77146378663. The reversal of 77146378640 is 4687364177.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235997 + ... + 458243.

It is an arithmetic number, because the mean of its divisors is an integer number (4485186888).

Almost surely, 2^77146378640 is an apocalyptic number.

It is an amenable number.

77146378640 is an abundant number, since it is smaller than the sum of its proper divisors (102261096880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77146378640 is a wasteful number, since it uses less digits than its factorization.

77146378640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226599 (or 226593 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 53.

It can be divided in two parts, 7714637 and 8640, that added together give a palindrome (7723277).

The spelling of 77146378640 in words is "seventy-seven billion, one hundred forty-six million, three hundred seventy-eight thousand, six hundred forty".