77473642887 has 40 divisors (see below), whose sum is σ = 123080330736. Its totient is φ = 48396572928.

The previous prime is 77473642861. The next prime is 77473642969. The reversal of 77473642887 is 78824637477.

77473642887 is a `hidden beast` number, since 7 + 7 + 473 + 64 + 28 + 87 = 666.

It is not a de Polignac number, because 77473642887 - 2⁶ = 77473642823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77473642837) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 188653 + ... + 436505.

Almost surely, 2^77473642887 is an apocalyptic number.

77473642887 is a deficient number, since it is larger than the sum of its proper divisors (45606687849).

77473642887 is a wasteful number, since it uses less digits than its factorization.

77473642887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248109 (or 248100 counting only the distinct ones).

The product of its digits is 88510464, while the sum is 63.

The spelling of 77473642887 in words is "seventy-seven billion, four hundred seventy-three million, six hundred forty-two thousand, eight hundred eighty-seven".