71897910 has 32 divisors (see below), whose sum is σ = 197206272. Its totient is φ = 16433760.

The previous prime is 71897899. The next prime is 71897911. The reversal of 71897910 is 1979817.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71897911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170976 + ... + 171395.

It is an arithmetic number, because the mean of its divisors is an integer number (6162696).

Almost surely, 2^71897910 is an apocalyptic number.

71897910 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

71897910 is an abundant number, since it is smaller than the sum of its proper divisors (125308362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71897910 is a wasteful number, since it uses less digits than its factorization.

71897910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342388.

The product of its (nonzero) digits is 31752, while the sum is 42.

The square root of 71897910 is about 8479.2635293403. The cubic root of 71897910 is about 415.8200459028.

The spelling of 71897910 in words is "seventy-one million, eight hundred ninety-seven thousand, nine hundred ten".