87620969 has 2 divisors, whose sum is σ = 87620970. Its totient is φ = 87620968.

The previous prime is 87620933. The next prime is 87620993. The reversal of 87620969 is 96902678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81667369 + 5953600 = 9037^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 87620969 - 2²⁰ = 86572393 is a prime.

It is a super-2 number, since 2×87620969² = 15354868416997922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87620569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43810484 + 43810485.

It is an arithmetic number, because the mean of its divisors is an integer number (43810485).

Almost surely, 2^87620969 is an apocalyptic number.

It is an amenable number.

87620969 is a deficient number, since it is larger than the sum of its proper divisors (1).

87620969 is an equidigital number, since it uses as much as digits as its factorization.

87620969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 87620969 is about 9360.6072986746. The cubic root of 87620969 is about 444.1564949656.

The spelling of 87620969 in words is "eighty-seven million, six hundred twenty thousand, nine hundred sixty-nine".