77869556 has 6 divisors (see below), whose sum is σ = 136271730. Its totient is φ = 38934776.

The previous prime is 77869541. The next prime is 77869573. The reversal of 77869556 is 65596877.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 51696100 + 26173456 = 7190^2 + 5116^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77869498 and 77869507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9733691 + ... + 9733698.

It is an arithmetic number, because the mean of its divisors is an integer number (22711955).

Almost surely, 2^77869556 is an apocalyptic number.

It is an amenable number.

77869556 is a deficient number, since it is larger than the sum of its proper divisors (58402174).

77869556 is a wasteful number, since it uses less digits than its factorization.

77869556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19467393 (or 19467391 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 53.

The square root of 77869556 is about 8824.3728389048. The cubic root of 77869556 is about 427.0275546354.

The spelling of 77869556 in words is "seventy-seven million, eight hundred sixty-nine thousand, five hundred fifty-six".