60647991 has 4 divisors (see below), whose sum is σ = 80863992. Its totient is φ = 40431992.

The previous prime is 60647971. The next prime is 60647999. The reversal of 60647991 is 19974606.

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 60647991 - 2⁷ = 60647863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (60647999) 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, 10107996 + ... + 10108001.

It is an arithmetic number, because the mean of its divisors is an integer number (20215998).

Almost surely, 2^60647991 is an apocalyptic number.

60647991 is a deficient number, since it is larger than the sum of its proper divisors (20216001).

60647991 is a wasteful number, since it uses less digits than its factorization.

60647991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20216000.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 60647991 is about 7787.6820042937. The cubic root of 60647991 is about 392.8910535891.

The spelling of 60647991 in words is "sixty million, six hundred forty-seven thousand, nine hundred ninety-one".