87691212 has 36 divisors (see below), whose sum is σ = 253330896. Its totient is φ = 25054560.

The previous prime is 87691207. The next prime is 87691217. The reversal of 87691212 is 21219678.

It is an interprime number because it is at equal distance from previous prime (87691207) and next prime (87691217).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (87691217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173739 + ... + 174242.

Almost surely, 2^87691212 is an apocalyptic number.

It is an amenable number.

87691212 is an abundant number, since it is smaller than the sum of its proper divisors (165639684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87691212 is a wasteful number, since it uses less digits than its factorization.

87691212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347998 (or 347993 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 87691212 is about 9364.3586005663. The cubic root of 87691212 is about 444.2751520697.

The spelling of 87691212 in words is "eighty-seven million, six hundred ninety-one thousand, two hundred twelve".