1620867587 has 2 divisors, whose sum is σ = 1620867588. Its totient is φ = 1620867586.

The previous prime is 1620867553. The next prime is 1620867641. The reversal of 1620867587 is 7857680261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1620867587 - 2²⁰ = 1619819011 is a prime.

It is not a weakly prime, because it can be changed into another prime (1620867517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810433793 + 810433794.

It is an arithmetic number, because the mean of its divisors is an integer number (810433794).

Almost surely, 2^1620867587 is an apocalyptic number.

1620867587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620867587 is an equidigital number, since it uses as much as digits as its factorization.

1620867587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The square root of 1620867587 is about 40259.9998385494. Note that the first 3 decimals coincide. The cubic root of 1620867587 is about 1174.6699147041.

The spelling of 1620867587 in words is "one billion, six hundred twenty million, eight hundred sixty-seven thousand, five hundred eighty-seven".