136390985640 has 384 divisors, whose sum is σ = 546990312960. Its totient is φ = 28701775872.

The previous prime is 136390985611. The next prime is 136390985719. The reversal of 136390985640 is 46589093631.

136390985640 is a `hidden beast` number, since 13 + 63 + 9 + 0 + 9 + 8 + 564 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13000477 + ... + 13010963.

It is an arithmetic number, because the mean of its divisors is an integer number (1424453940).

Almost surely, 2^136390985640 is an apocalyptic number.

136390985640 is a gapful number since it is divisible by the number (10) 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 136390985640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273495156480).

136390985640 is an abundant number, since it is smaller than the sum of its proper divisors (410599327320).

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

136390985640 is a wasteful number, since it uses less digits than its factorization.

136390985640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10921 (or 10914 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 136390985640 in words is "one hundred thirty-six billion, three hundred ninety million, nine hundred eighty-five thousand, six hundred forty".