87878773 has 2 divisors, whose sum is σ = 87878774. Its totient is φ = 87878772.

The previous prime is 87878761. The next prime is 87878783. The reversal of 87878773 is 37787878.

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., 64288324 + 23590449 = 8018^2 + 4857^2 .

It is a cyclic number.

It is not a de Polignac number, because 87878773 - 2²¹ = 85781621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87878723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43939386 + 43939387.

It is an arithmetic number, because the mean of its divisors is an integer number (43939387).

Almost surely, 2^87878773 is an apocalyptic number.

It is an amenable number.

87878773 is a deficient number, since it is larger than the sum of its proper divisors (1).

87878773 is an equidigital number, since it uses as much as digits as its factorization.

87878773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3687936, while the sum is 55.

The square root of 87878773 is about 9374.3678720221. The cubic root of 87878773 is about 444.5916769542.

The spelling of 87878773 in words is "eighty-seven million, eight hundred seventy-eight thousand, seven hundred seventy-three".