87781428389 has 8 divisors (see below), whose sum is σ = 91704172032. Its totient is φ = 83867531440.

The previous prime is 87781428373. The next prime is 87781428419. The reversal of 87781428389 is 98382418778.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87781428389 - 2⁴ = 87781428373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87781428989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2191382 + ... + 2231079.

It is an arithmetic number, because the mean of its divisors is an integer number (11463021504).

Almost surely, 2^87781428389 is an apocalyptic number.

It is an amenable number.

87781428389 is a deficient number, since it is larger than the sum of its proper divisors (3922743643).

87781428389 is a wasteful number, since it uses less digits than its factorization.

87781428389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4423347.

The product of its digits is 43352064, while the sum is 65.

The spelling of 87781428389 in words is "eighty-seven billion, seven hundred eighty-one million, four hundred twenty-eight thousand, three hundred eighty-nine".