87645427 has 4 divisors (see below), whose sum is σ = 88701480. Its totient is φ = 86589376.

The previous prime is 87645403. The next prime is 87645431. The reversal of 87645427 is 72454678.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72454678 = 2 ⋅36227339.

It is a cyclic number.

It is not a de Polignac number, because 87645427 - 2²³ = 79256819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87645457) 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, 527902 + ... + 528067.

It is an arithmetic number, because the mean of its divisors is an integer number (22175370).

Almost surely, 2^87645427 is an apocalyptic number.

87645427 is a deficient number, since it is larger than the sum of its proper divisors (1056053).

87645427 is a wasteful number, since it uses less digits than its factorization.

87645427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056052.

The product of its digits is 376320, while the sum is 43.

The square root of 87645427 is about 9361.9136398495. The cubic root of 87645427 is about 444.1978175282.

The spelling of 87645427 in words is "eighty-seven million, six hundred forty-five thousand, four hundred twenty-seven".