672643987 has 2 divisors, whose sum is σ = 672643988. Its totient is φ = 672643986.

The previous prime is 672643957. The next prime is 672644017. The reversal of 672643987 is 789346276.

It is a balanced prime because it is at equal distance from previous prime (672643957) and next prime (672644017).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-672643987 is a prime.

It is not a weakly prime, because it can be changed into another prime (672643927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336321993 + 336321994.

It is an arithmetic number, because the mean of its divisors is an integer number (336321994).

Almost surely, 2^672643987 is an apocalyptic number.

672643987 is a deficient number, since it is larger than the sum of its proper divisors (1).

672643987 is an equidigital number, since it uses as much as digits as its factorization.

672643987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 52.

The square root of 672643987 is about 25935.3809881405. The cubic root of 672643987 is about 876.1835356109.

The spelling of 672643987 in words is "six hundred seventy-two million, six hundred forty-three thousand, nine hundred eighty-seven".