136670640 has 40 divisors (see below), whose sum is σ = 423679728. Its totient is φ = 36445440.

The previous prime is 136670627. The next prime is 136670647. The reversal of 136670640 is 46076631.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (136670647) 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, 284491 + ... + 284970.

Almost surely, 2^136670640 is an apocalyptic number.

136670640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136670640 is an abundant number, since it is smaller than the sum of its proper divisors (287009088).

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

136670640 is a wasteful number, since it uses less digits than its factorization.

136670640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569477 (or 569471 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 136670640 is about 11690.6218825176. The cubic root of 136670640 is about 515.1002287093.

The spelling of 136670640 in words is "one hundred thirty-six million, six hundred seventy thousand, six hundred forty".