87266431 has 4 divisors (see below), whose sum is σ = 99733072. Its totient is φ = 74799792.

The previous prime is 87266429. The next prime is 87266437. The reversal of 87266431 is 13466278.

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

It is a cyclic number.

It is not a de Polignac number, because 87266431 - 2¹ = 87266429 is a prime.

It is a super-2 number, since 2×87266431² = 15230859958955522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87266437) 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, 6233310 + ... + 6233323.

It is an arithmetic number, because the mean of its divisors is an integer number (24933268).

Almost surely, 2^87266431 is an apocalyptic number.

87266431 is a deficient number, since it is larger than the sum of its proper divisors (12466641).

87266431 is a wasteful number, since it uses less digits than its factorization.

87266431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12466640.

The product of its digits is 48384, while the sum is 37.

The square root of 87266431 is about 9341.6503359952. The cubic root of 87266431 is about 443.5566262923.

The spelling of 87266431 in words is "eighty-seven million, two hundred sixty-six thousand, four hundred thirty-one".