7657987 has 2 divisors, whose sum is σ = 7657988. Its totient is φ = 7657986.

The previous prime is 7657967. The next prime is 7657997. The reversal of 7657987 is 7897567.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7657987 - 2¹¹ = 7655939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7657987.

It is not a weakly prime, because it can be changed into another prime (7657907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3828993 + 3828994.

It is an arithmetic number, because the mean of its divisors is an integer number (3828994).

Almost surely, 2^7657987 is an apocalyptic number.

7657987 is a deficient number, since it is larger than the sum of its proper divisors (1).

7657987 is an equidigital number, since it uses as much as digits as its factorization.

7657987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 740880, while the sum is 49.

The square root of 7657987 is about 2767.3068134921. The cubic root of 7657987 is about 197.1082830368.

The spelling of 7657987 in words is "seven million, six hundred fifty-seven thousand, nine hundred eighty-seven".