77885647487 has 4 divisors (see below), whose sum is σ = 78175185480. Its totient is φ = 77596109496.

The previous prime is 77885647453. The next prime is 77885647531. The reversal of 77885647487 is 78474658877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78474658877 = 271 ⋅289574387.

It is a cyclic number.

It is not a de Polignac number, because 77885647487 - 2¹⁶ = 77885581951 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77885647487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77885647447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144768593 + ... + 144769130.

It is an arithmetic number, because the mean of its divisors is an integer number (19543796370).

Almost surely, 2^77885647487 is an apocalyptic number.

77885647487 is a deficient number, since it is larger than the sum of its proper divisors (289537993).

77885647487 is a wasteful number, since it uses less digits than its factorization.

77885647487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289537992.

The product of its digits is 590069760, while the sum is 71.

The spelling of 77885647487 in words is "seventy-seven billion, eight hundred eighty-five million, six hundred forty-seven thousand, four hundred eighty-seven".