87878761 has 2 divisors, whose sum is σ = 87878762. Its totient is φ = 87878760.

The previous prime is 87878723. The next prime is 87878773. The reversal of 87878761 is 16787878.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85673536 + 2205225 = 9256^2 + 1485^2 .

It is a cyclic number.

It is not a de Polignac number, because 87878761 - 2²⁵ = 54324329 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 87878699 and 87878708.

It is not a weakly prime, because it can be changed into another prime (87872761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43939380 + 43939381.

It is an arithmetic number, because the mean of its divisors is an integer number (43939381).

Almost surely, 2^87878761 is an apocalyptic number.

It is an amenable number.

87878761 is a deficient number, since it is larger than the sum of its proper divisors (1).

87878761 is an equidigital number, since it uses as much as digits as its factorization.

87878761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1053696, while the sum is 52.

The square root of 87878761 is about 9374.3672319789. The cubic root of 87878761 is about 444.5916567176.

The spelling of 87878761 in words is "eighty-seven million, eight hundred seventy-eight thousand, seven hundred sixty-one".