136628421 has 4 divisors (see below), whose sum is σ = 182171232. Its totient is φ = 91085612.

The previous prime is 136628419. The next prime is 136628423. The reversal of 136628421 is 124826631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (136628419) and next prime (136628423).

It is a cyclic number.

It is not a de Polignac number, because 136628421 - 2¹ = 136628419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136628423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22771401 + ... + 22771406.

It is an arithmetic number, because the mean of its divisors is an integer number (45542808).

Almost surely, 2^136628421 is an apocalyptic number.

It is an amenable number.

136628421 is a deficient number, since it is larger than the sum of its proper divisors (45542811).

136628421 is an equidigital number, since it uses as much as digits as its factorization.

136628421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45542810.

The product of its digits is 13824, while the sum is 33.

The square root of 136628421 is about 11688.8160649400. The cubic root of 136628421 is about 515.0471832850.

The spelling of 136628421 in words is "one hundred thirty-six million, six hundred twenty-eight thousand, four hundred twenty-one".