87771843 has 18 divisors (see below), whose sum is σ = 131696292. Its totient is φ = 58417200.

The previous prime is 87771839. The next prime is 87771851. The reversal of 87771843 is 34817778.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 87771843 - 2² = 87771839 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87771823) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 145743 + ... + 146343.

Almost surely, 2^87771843 is an apocalyptic number.

87771843 is a deficient number, since it is larger than the sum of its proper divisors (43924449).

87771843 is an frugal number, since it uses more digits than its factorization.

87771843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217 (or 604 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The square root of 87771843 is about 9368.6628181401. The cubic root of 87771843 is about 444.4112788840.

The spelling of 87771843 in words is "eighty-seven million, seven hundred seventy-one thousand, eight hundred forty-three".