71900087 has 4 divisors (see below), whose sum is σ = 82171536. Its totient is φ = 61628640.

The previous prime is 71900069. The next prime is 71900107. The reversal of 71900087 is 78000917.

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 71900087 - 2⁸ = 71899831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71900887) 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, 5135714 + ... + 5135727.

It is an arithmetic number, because the mean of its divisors is an integer number (20542884).

Almost surely, 2^71900087 is an apocalyptic number.

71900087 is a deficient number, since it is larger than the sum of its proper divisors (10271449).

71900087 is a wasteful number, since it uses less digits than its factorization.

71900087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10271448.

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 71900087 is about 8479.3919003664. The cubic root of 71900087 is about 415.8242427383.

It can be divided in two parts, 7 and 1900087, that multiplied together give a square (13300609 = 3647²).

The spelling of 71900087 in words is "seventy-one million, nine hundred thousand, eighty-seven".