136981890 has 24 divisors (see below), whose sum is σ = 356153148. Its totient is φ = 36528480.

The previous prime is 136981879. The next prime is 136981909. The reversal of 136981890 is 98189631.

It can be written as a sum of positive squares in 2 ways, for example, as 134026929 + 2954961 = 11577^2 + 1719^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 760921 + ... + 761100.

Almost surely, 2^136981890 is an apocalyptic number.

136981890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

136981890 is an abundant number, since it is smaller than the sum of its proper divisors (219171258).

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

136981890 is a wasteful number, since it uses less digits than its factorization.

136981890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522034 (or 1522031 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 136981890 is about 11703.9262642927. The cubic root of 136981890 is about 515.4909573334.

The spelling of 136981890 in words is "one hundred thirty-six million, nine hundred eighty-one thousand, eight hundred ninety".