136978740 has 36 divisors (see below), whose sum is σ = 415502724. Its totient is φ = 36527616.

The previous prime is 136978703. The next prime is 136978747. The reversal of 136978740 is 47879631.

It can be written as a sum of positive squares in 2 ways, for example, as 97891236 + 39087504 = 9894^2 + 6252^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136978747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 380317 + ... + 380676.

Almost surely, 2^136978740 is an apocalyptic number.

136978740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136978740 is an abundant number, since it is smaller than the sum of its proper divisors (278523984).

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

136978740 is a wasteful number, since it uses less digits than its factorization.

136978740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761008 (or 761003 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 136978740 is about 11703.7916932932. The cubic root of 136978740 is about 515.4870059377.

The spelling of 136978740 in words is "one hundred thirty-six million, nine hundred seventy-eight thousand, seven hundred forty".