87778937 has 2 divisors, whose sum is σ = 87778938. Its totient is φ = 87778936.

The previous prime is 87778931. The next prime is 87778981. The reversal of 87778937 is 73987778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85673536 + 2105401 = 9256^2 + 1451^2 .

It is a cyclic number.

It is not a de Polignac number, because 87778937 - 2¹⁴ = 87762553 is a prime.

It is not a weakly prime, because it can be changed into another prime (87778931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43889468 + 43889469.

It is an arithmetic number, because the mean of its divisors is an integer number (43889469).

Almost surely, 2^87778937 is an apocalyptic number.

It is an amenable number.

87778937 is a deficient number, since it is larger than the sum of its proper divisors (1).

87778937 is an equidigital number, since it uses as much as digits as its factorization.

87778937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4148928, while the sum is 56.

The square root of 87778937 is about 9369.0414130796. The cubic root of 87778937 is about 444.4232514732.

The spelling of 87778937 in words is "eighty-seven million, seven hundred seventy-eight thousand, nine hundred thirty-seven".