42664087 has 2 divisors, whose sum is σ = 42664088. Its totient is φ = 42664086.

The previous prime is 42664081. The next prime is 42664147. The reversal of 42664087 is 78046624.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42664087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42664081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21332043 + 21332044.

It is an arithmetic number, because the mean of its divisors is an integer number (21332044).

Almost surely, 2^42664087 is an apocalyptic number.

42664087 is a deficient number, since it is larger than the sum of its proper divisors (1).

42664087 is an equidigital number, since it uses as much as digits as its factorization.

42664087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 42664087 is about 6531.7751798420. The cubic root of 42664087 is about 349.4251434201.

It can be divided in two parts, 4266408 and 7, that multiplied together give a triangular number (29864856 = T₇₇₂₈).

The spelling of 42664087 in words is "forty-two million, six hundred sixty-four thousand, eighty-seven".