65632881 has 8 divisors (see below), whose sum is σ = 88140640. Its totient is φ = 43440192.

The previous prime is 65632877. The next prime is 65632883. The reversal of 65632881 is 18823656.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65632881 - 2² = 65632877 is a prime.

It is a super-2 number, since 2×65632881² = 8615350136720322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65632883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78280 + ... + 79113.

It is an arithmetic number, because the mean of its divisors is an integer number (11017580).

Almost surely, 2^65632881 is an apocalyptic number.

It is an amenable number.

65632881 is a deficient number, since it is larger than the sum of its proper divisors (22507759).

65632881 is a wasteful number, since it uses less digits than its factorization.

65632881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157535.

The product of its digits is 69120, while the sum is 39.

The square root of 65632881 is about 8101.4122842872. The cubic root of 65632881 is about 403.3733074391.

The spelling of 65632881 in words is "sixty-five million, six hundred thirty-two thousand, eight hundred eighty-one".