21760770 has 16 divisors (see below), whose sum is σ = 52225920. Its totient is φ = 5802864.

The previous prime is 21760763. The next prime is 21760801. The reversal of 21760770 is 7706712.

It is a happy number.

It is a super-2 number, since 2×21760770² = 947062221985800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 725359 = 21760770 / (2 + 1 + 7 + 6 + 0 + 7 + 7 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362650 + ... + 362709.

It is an arithmetic number, because the mean of its divisors is an integer number (3264120).

Almost surely, 2^21760770 is an apocalyptic number.

21760770 is an abundant number, since it is smaller than the sum of its proper divisors (30465150).

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

21760770 is a wasteful number, since it uses less digits than its factorization.

21760770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725369.

The product of its (nonzero) digits is 4116, while the sum is 30.

The square root of 21760770 is about 4664.8440488402. The cubic root of 21760770 is about 279.1845748765.

The spelling of 21760770 in words is "twenty-one million, seven hundred sixty thousand, seven hundred seventy".