71938890 has 48 divisors (see below), whose sum is σ = 187619328. Its totient is φ = 19124448.

The previous prime is 71938843. The next prime is 71938897. The reversal of 71938890 is 9883917.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71938897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33427 + ... + 35513.

It is an arithmetic number, because the mean of its divisors is an integer number (3908736).

Almost surely, 2^71938890 is an apocalyptic number.

71938890 is an abundant number, since it is smaller than the sum of its proper divisors (115680438).

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

71938890 is a wasteful number, since it uses less digits than its factorization.

71938890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2483 (or 2480 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 71938890 is about 8481.6796685562. The cubic root of 71938890 is about 415.8990332196.

It can be divided in two parts, 71 and 938890, that added together give a square (938961 = 969²).

The spelling of 71938890 in words is "seventy-one million, nine hundred thirty-eight thousand, eight hundred ninety".