87620417 has 2 divisors, whose sum is σ = 87620418. Its totient is φ = 87620416.

The previous prime is 87620399. The next prime is 87620441. The reversal of 87620417 is 71402678.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54626881 + 32993536 = 7391^2 + 5744^2 .

It is a cyclic number.

It is not a de Polignac number, because 87620417 - 2¹⁸ = 87358273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87620447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43810208 + 43810209.

It is an arithmetic number, because the mean of its divisors is an integer number (43810209).

Almost surely, 2^87620417 is an apocalyptic number.

It is an amenable number.

87620417 is a deficient number, since it is larger than the sum of its proper divisors (1).

87620417 is an equidigital number, since it uses as much as digits as its factorization.

87620417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 87620417 is about 9360.5778133617. The cubic root of 87620417 is about 444.1555622554.

The spelling of 87620417 in words is "eighty-seven million, six hundred twenty thousand, four hundred seventeen".