87796421 has 2 divisors, whose sum is σ = 87796422. Its totient is φ = 87796420.

The previous prime is 87796391. The next prime is 87796463. The reversal of 87796421 is 12469778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87628321 + 168100 = 9361^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 87796421 - 2¹⁰ = 87795397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87790421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43898210 + 43898211.

It is an arithmetic number, because the mean of its divisors is an integer number (43898211).

Almost surely, 2^87796421 is an apocalyptic number.

It is an amenable number.

87796421 is a deficient number, since it is larger than the sum of its proper divisors (1).

87796421 is an equidigital number, since it uses as much as digits as its factorization.

87796421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 44.

The square root of 87796421 is about 9369.9744396663. The cubic root of 87796421 is about 444.4527565783.

The spelling of 87796421 in words is "eighty-seven million, seven hundred ninety-six thousand, four hundred twenty-one".