71018990 has 16 divisors (see below), whose sum is σ = 146096352. Its totient is φ = 24349344.

The previous prime is 71018989. The next prime is 71019001. The reversal of 71018990 is 9981017.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 71018990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 507209 + ... + 507348.

It is an arithmetic number, because the mean of its divisors is an integer number (9131022).

Almost surely, 2^71018990 is an apocalyptic number.

71018990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

71018990 is an abundant number, since it is smaller than the sum of its proper divisors (75077362).

71018990 is a wasteful number, since it uses less digits than its factorization.

71018990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014571.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 71018990 is about 8427.2765470228. The cubic root of 71018990 is about 414.1186890829.

The spelling of 71018990 in words is "seventy-one million, eighteen thousand, nine hundred ninety".