21768462 has 24 divisors (see below), whose sum is σ = 47483280. Its totient is φ = 7207200.

The previous prime is 21768457. The next prime is 21768497. The reversal of 21768462 is 26486712.

It is a congruent number.

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, 1287 + ... + 6722.

It is an arithmetic number, because the mean of its divisors is an integer number (1978470).

Almost surely, 2^21768462 is an apocalyptic number.

21768462 is an abundant number, since it is smaller than the sum of its proper divisors (25714818).

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

21768462 is a wasteful number, since it uses less digits than its factorization.

21768462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8168 (or 8165 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 21768462 is about 4665.6684408560. The cubic root of 21768462 is about 279.2174664021.

The spelling of 21768462 in words is "twenty-one million, seven hundred sixty-eight thousand, four hundred sixty-two".