65215854 has 72 divisors (see below), whose sum is σ = 161211960. Its totient is φ = 19744560.

The previous prime is 65215853. The next prime is 65215873. The reversal of 65215854 is 45851256.

It is a super-2 number, since 2×65215854² = 8506215225898632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65215853) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 58252 + ... + 59360.

It is an arithmetic number, because the mean of its divisors is an integer number (2239055).

Almost surely, 2^65215854 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65215854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80605980).

65215854 is an abundant number, since it is smaller than the sum of its proper divisors (95996106).

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

65215854 is a wasteful number, since it uses less digits than its factorization.

65215854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148 (or 1125 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 65215854 is about 8075.6333497751. The cubic root of 65215854 is about 402.5171557571.

The spelling of 65215854 in words is "sixty-five million, two hundred fifteen thousand, eight hundred fifty-four".