77489647488 has 512 divisors, whose sum is σ = 263208960000. Its totient is φ = 22224844800.

The previous prime is 77489647483. The next prime is 77489647493. The reversal of 77489647488 is 88474698477.

77489647488 is a `hidden beast` number, since 7 + 7 + 4 + 89 + 64 + 7 + 488 = 666.

It is an interprime number because it is at equal distance from previous prime (77489647483) and next prime (77489647493).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77489647483) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 55388613 + ... + 55390011.

It is an arithmetic number, because the mean of its divisors is an integer number (514080000).

Almost surely, 2^77489647488 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 77489647488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131604480000).

77489647488 is an abundant number, since it is smaller than the sum of its proper divisors (185719312512).

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

77489647488 is a wasteful number, since it uses less digits than its factorization.

77489647488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511 (or 1493 counting only the distinct ones).

The product of its digits is 606928896, while the sum is 72.

The spelling of 77489647488 in words is "seventy-seven billion, four hundred eighty-nine million, six hundred forty-seven thousand, four hundred eighty-eight".