136461990 has 128 divisors (see below), whose sum is σ = 411402240. Its totient is φ = 28245888.

The previous prime is 136461989. The next prime is 136461991. The reversal of 136461990 is 99164631.

It is an interprime number because it is at equal distance from previous prime (136461989) and next prime (136461991).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136461991) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 91027 + ... + 92513.

It is an arithmetic number, because the mean of its divisors is an integer number (3214080).

Almost surely, 2^136461990 is an apocalyptic number.

136461990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 136461990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205701120).

136461990 is an abundant number, since it is smaller than the sum of its proper divisors (274940250).

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

136461990 is a wasteful number, since it uses less digits than its factorization.

136461990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 136461990 is about 11681.6946544583. The cubic root of 136461990 is about 514.8379670604.

The spelling of 136461990 in words is "one hundred thirty-six million, four hundred sixty-one thousand, nine hundred ninety".