77788671505628 has 12 divisors (see below), whose sum is σ = 136130313472440. Its totient is φ = 38894296227792.

The previous prime is 77788671505541. The next prime is 77788671505651. The reversal of 77788671505628 is 82650517688777.

It is a super-2 number, since 2×77788671505628² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5207426 + ... + 13516457.

It is an arithmetic number, because the mean of its divisors is an integer number (11344192789370).

Almost surely, 2^{77788671505628} is an apocalyptic number.

It is an amenable number.

77788671505628 is a deficient number, since it is larger than the sum of its proper divisors (58341641966812).

77788671505628 is a wasteful number, since it uses less digits than its factorization.

77788671505628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19762516 (or 19762514 counting only the distinct ones).

The product of its (nonzero) digits is 2212761600, while the sum is 77.

The spelling of 77788671505628 in words is "seventy-seven trillion, seven hundred eighty-eight billion, six hundred seventy-one million, five hundred five thousand, six hundred twenty-eight".