640280467 has 2 divisors, whose sum is σ = 640280468. Its totient is φ = 640280466.

The previous prime is 640280453. The next prime is 640280489. The reversal of 640280467 is 764082046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640280467 - 2²³ = 631891859 is a prime.

It is not a weakly prime, because it can be changed into another prime (640280437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320140233 + 320140234.

It is an arithmetic number, because the mean of its divisors is an integer number (320140234).

Almost surely, 2^640280467 is an apocalyptic number.

640280467 is a deficient number, since it is larger than the sum of its proper divisors (1).

640280467 is an equidigital number, since it uses as much as digits as its factorization.

640280467 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 640280467 is about 25303.7638899828. The cubic root of 640280467 is about 861.8997425938.

The spelling of 640280467 in words is "six hundred forty million, two hundred eighty thousand, four hundred sixty-seven".