13621770 has 80 divisors (see below), whose sum is σ = 37322208. Its totient is φ = 3564000.

The previous prime is 13621763. The next prime is 13621781. The reversal of 13621770 is 7712631.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 54145 + ... + 54395.

Almost surely, 2^13621770 is an apocalyptic number.

13621770 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 13621770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18661104).

13621770 is an abundant number, since it is smaller than the sum of its proper divisors (23700438).

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

13621770 is a wasteful number, since it uses less digits than its factorization.

13621770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 13621770 is about 3690.7682127167. The cubic root of 13621770 is about 238.8239338654.

13621770 divided by its sum of digits (27) gives a triangular number (504510 = T₁₀₀₄).

The spelling of 13621770 in words is "thirteen million, six hundred twenty-one thousand, seven hundred seventy".