57997987 has 2 divisors, whose sum is σ = 57997988. Its totient is φ = 57997986.

The previous prime is 57997943. The next prime is 57998027. The reversal of 57997987 is 78979975.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57997987 is a prime.

It is not a weakly prime, because it can be changed into another prime (57997087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28998993 + 28998994.

It is an arithmetic number, because the mean of its divisors is an integer number (28998994).

Almost surely, 2^57997987 is an apocalyptic number.

57997987 is a deficient number, since it is larger than the sum of its proper divisors (1).

57997987 is an equidigital number, since it uses as much as digits as its factorization.

57997987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10001880, while the sum is 61.

The square root of 57997987 is about 7615.6409447925. The cubic root of 57997987 is about 387.0831858071.

The spelling of 57997987 in words is "fifty-seven million, nine hundred ninety-seven thousand, nine hundred eighty-seven".