65440987 has 2 divisors, whose sum is σ = 65440988. Its totient is φ = 65440986.

The previous prime is 65440979. The next prime is 65441021. The reversal of 65440987 is 78904456.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65440987 - 2³ = 65440979 is a prime.

It is not a weakly prime, because it can be changed into another prime (65440937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32720493 + 32720494.

It is an arithmetic number, because the mean of its divisors is an integer number (32720494).

Almost surely, 2^65440987 is an apocalyptic number.

65440987 is a deficient number, since it is larger than the sum of its proper divisors (1).

65440987 is an equidigital number, since it uses as much as digits as its factorization.

65440987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 65440987 is about 8089.5603712439. The cubic root of 65440987 is about 402.9798030627.

The spelling of 65440987 in words is "sixty-five million, four hundred forty thousand, nine hundred eighty-seven".