77396571648 has 360 divisors, whose sum is σ = 247683980544. Its totient is φ = 23247544320.

The previous prime is 77396571617. The next prime is 77396571661. The reversal of 77396571648 is 84617569377.

It is a congruent number.

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 in 35 ways as a sum of consecutive naturals, for example, 70810590 + ... + 70811682.

Almost surely, 2^77396571648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77396571648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123841990272).

77396571648 is an abundant number, since it is smaller than the sum of its proper divisors (170287408896).

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

77396571648 is a wasteful number, since it uses less digits than its factorization.

77396571648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266 (or 1236 counting only the distinct ones).

The product of its digits is 53343360, while the sum is 63.

The spelling of 77396571648 in words is "seventy-seven billion, three hundred ninety-six million, five hundred seventy-one thousand, six hundred forty-eight".