386697991680 has 2880 divisors, whose sum is σ = 1948393294848. Its totient is φ = 70946979840.

The previous prime is 386697991651. The next prime is 386697991709. The reversal of 386697991680 is 86199796683.

It is an interprime number because it is at equal distance from previous prime (386697991651) and next prime (386697991709).

It is a tau number, because it is divible by the number of its divisors (2880).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 386697991599 and 386697991608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 16812956149 + ... + 16812956171.

Almost surely, 2^386697991680 is an apocalyptic number.

386697991680 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 386697991680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (974196647424).

386697991680 is an abundant number, since it is smaller than the sum of its proper divisors (1561695303168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

386697991680 is an equidigital number, since it uses as much as digits as its factorization.

386697991680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 211631616, while the sum is 72.

The spelling of 386697991680 in words is "three hundred eighty-six billion, six hundred ninety-seven million, nine hundred ninety-one thousand, six hundred eighty".