87781396 has 12 divisors (see below), whose sum is σ = 153710452. Its totient is φ = 43864128.

The previous prime is 87781391. The next prime is 87781417. The reversal of 87781396 is 69318778.

It can be written as a sum of positive squares in 2 ways, for example, as 41731600 + 46049796 = 6460^2 + 6786^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87781391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2056 + ... + 13408.

Almost surely, 2^87781396 is an apocalyptic number.

It is an amenable number.

87781396 is a deficient number, since it is larger than the sum of its proper divisors (65929056).

87781396 is a wasteful number, since it uses less digits than its factorization.

87781396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13290 (or 13288 counting only the distinct ones).

The product of its digits is 508032, while the sum is 49.

The square root of 87781396 is about 9369.1726422347. The cubic root of 87781396 is about 444.4274013928.

The spelling of 87781396 in words is "eighty-seven million, seven hundred eighty-one thousand, three hundred ninety-six".