65381890 has 32 divisors (see below), whose sum is σ = 135302400. Its totient is φ = 22282944.

The previous prime is 65381879. The next prime is 65381909. The reversal of 65381890 is 9818356.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9411 + ... + 14809.

It is an arithmetic number, because the mean of its divisors is an integer number (4228200).

Almost surely, 2^65381890 is an apocalyptic number.

65381890 is an abundant number, since it is smaller than the sum of its proper divisors (69920510).

65381890 is a wasteful number, since it uses less digits than its factorization.

65381890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5586.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 65381890 is about 8085.9068755459. The cubic root of 65381890 is about 402.8584618317.

The spelling of 65381890 in words is "sixty-five million, three hundred eighty-one thousand, eight hundred ninety".