65678091 has 4 divisors (see below), whose sum is σ = 87570792. Its totient is φ = 43785392.

The previous prime is 65678083. The next prime is 65678101. The reversal of 65678091 is 19087656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65678091 - 2³ = 65678083 is a prime.

It is a super-2 number, since 2×65678091² = 8627223274808562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65678791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10946346 + ... + 10946351.

It is an arithmetic number, because the mean of its divisors is an integer number (21892698).

Almost surely, 2^65678091 is an apocalyptic number.

65678091 is a deficient number, since it is larger than the sum of its proper divisors (21892701).

65678091 is a wasteful number, since it uses less digits than its factorization.

65678091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21892700.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 65678091 is about 8104.2020581918. The cubic root of 65678091 is about 403.4659049362.

The spelling of 65678091 in words is "sixty-five million, six hundred seventy-eight thousand, ninety-one".