87083721 has 8 divisors (see below), whose sum is σ = 129012960. Its totient is φ = 58055796.

The previous prime is 87083699. The next prime is 87083761. The reversal of 87083721 is 12738078.

It is not a de Polignac number, because 87083721 - 2⁶ = 87083657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87083761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1612635 + ... + 1612688.

It is an arithmetic number, because the mean of its divisors is an integer number (16126620).

Almost surely, 2^87083721 is an apocalyptic number.

It is an amenable number.

87083721 is a deficient number, since it is larger than the sum of its proper divisors (41929239).

87083721 is a wasteful number, since it uses less digits than its factorization.

87083721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3225332 (or 3225326 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 87083721 is about 9331.8658905923. The cubic root of 87083721 is about 443.2468513666.

The spelling of 87083721 in words is "eighty-seven million, eighty-three thousand, seven hundred twenty-one".