87970691 has 4 divisors (see below), whose sum is σ = 88054512. Its totient is φ = 87886872.

The previous prime is 87970681. The next prime is 87970709. The reversal of 87970691 is 19607978.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87970691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87970651) 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, 40316 + ... + 42441.

It is an arithmetic number, because the mean of its divisors is an integer number (22013628).

Almost surely, 2^87970691 is an apocalyptic number.

87970691 is a deficient number, since it is larger than the sum of its proper divisors (83821).

87970691 is a wasteful number, since it uses less digits than its factorization.

87970691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83820.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 87970691 is about 9379.2692146030. The cubic root of 87970691 is about 444.7466318485.

The spelling of 87970691 in words is "eighty-seven million, nine hundred seventy thousand, six hundred ninety-one".