86928780621 has 8 divisors (see below), whose sum is σ = 115906508640. Its totient is φ = 57951786512.

The previous prime is 86928780619. The next prime is 86928780647. The reversal of 86928780621 is 12608782968.

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 86928780621 - 2¹ = 86928780619 is a prime.

It is a super-2 number, since 2×86928780621² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86928780691) 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, 219070 + ... + 471008.

It is an arithmetic number, because the mean of its divisors is an integer number (14488313580).

Almost surely, 2^86928780621 is an apocalyptic number.

It is an amenable number.

86928780621 is a deficient number, since it is larger than the sum of its proper divisors (28977728019).

86928780621 is a wasteful number, since it uses less digits than its factorization.

86928780621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366955.

The product of its (nonzero) digits is 4644864, while the sum is 57.

The spelling of 86928780621 in words is "eighty-six billion, nine hundred twenty-eight million, seven hundred eighty thousand, six hundred twenty-one".