65432991 has 16 divisors (see below), whose sum is σ = 94438400. Its totient is φ = 40059360.

The previous prime is 65432933. The next prime is 65432993. The reversal of 65432991 is 19923456.

It is not a de Polignac number, because 65432991 - 2²² = 61238687 is a prime.

It is a super-2 number, since 2×65432991² = 8562952622412162, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65432993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3546 + ... + 11976.

It is an arithmetic number, because the mean of its divisors is an integer number (5902400).

Almost surely, 2^65432991 is an apocalyptic number.

65432991 is a deficient number, since it is larger than the sum of its proper divisors (29005409).

65432991 is a wasteful number, since it uses less digits than its factorization.

65432991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8646.

The product of its digits is 58320, while the sum is 39.

The square root of 65432991 is about 8089.0661389310. The cubic root of 65432991 is about 402.9633895075.

The spelling of 65432991 in words is "sixty-five million, four hundred thirty-two thousand, nine hundred ninety-one".