136961680 has 40 divisors (see below), whose sum is σ = 318979584. Its totient is φ = 54691200.

The previous prime is 136961663. The next prime is 136961687. The reversal of 136961680 is 86169631.

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

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (136961687) 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, 63825 + ... + 65935.

Almost surely, 2^136961680 is an apocalyptic number.

136961680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136961680 is an abundant number, since it is smaller than the sum of its proper divisors (182017904).

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

136961680 is a wasteful number, since it uses less digits than its factorization.

136961680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2935 (or 2929 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 136961680 is about 11703.0628469645. The cubic root of 136961680 is about 515.4656046277.

It can be divided in two parts, 136961 and 680, that added together give a square (137641 = 371²).

The spelling of 136961680 in words is "one hundred thirty-six million, nine hundred sixty-one thousand, six hundred eighty".