136378640 has 40 divisors (see below), whose sum is σ = 317979648. Its totient is φ = 54396800.

The previous prime is 136378639. The next prime is 136378643. The reversal of 136378640 is 46873631.

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

It is a junction number, because it is equal to n+sod(n) for n = 136378594 and 136378603.

It is not an unprimeable number, because it can be changed into a prime (136378643) 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, 28415 + ... + 32865.

Almost surely, 2^136378640 is an apocalyptic number.

136378640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136378640 is an abundant number, since it is smaller than the sum of its proper divisors (181601008).

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

136378640 is a wasteful number, since it uses less digits than its factorization.

136378640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4847 (or 4841 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 136378640 is about 11678.1265620818. The cubic root of 136378640 is about 514.7331259388.

The spelling of 136378640 in words is "one hundred thirty-six million, three hundred seventy-eight thousand, six hundred forty".