77495771808 has 432 divisors, whose sum is σ = 286297030656. Its totient is φ = 19360373760.

The previous prime is 77495771791. The next prime is 77495771813. The reversal of 77495771808 is 80817759477.

77495771808 is a `hidden beast` number, since 7 + 7 + 49 + 577 + 18 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 9456993 + ... + 9465183.

It is an arithmetic number, because the mean of its divisors is an integer number (662724608).

Almost surely, 2^77495771808 is an apocalyptic number.

77495771808 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77495771808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143148515328).

77495771808 is an abundant number, since it is smaller than the sum of its proper divisors (208801258848).

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

77495771808 is a wasteful number, since it uses less digits than its factorization.

77495771808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8265 (or 8235 counting only the distinct ones).

The product of its (nonzero) digits is 27659520, while the sum is 63.

The spelling of 77495771808 in words is "seventy-seven billion, four hundred ninety-five million, seven hundred seventy-one thousand, eight hundred eight".