71455890 has 64 divisors (see below), whose sum is σ = 188116992. Its totient is φ = 17227200.

The previous prime is 71455877. The next prime is 71455919. The reversal of 71455890 is 9855417.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73105 + ... + 74075.

It is an arithmetic number, because the mean of its divisors is an integer number (2939328).

Almost surely, 2^71455890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71455890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94058496).

71455890 is an abundant number, since it is smaller than the sum of its proper divisors (116661102).

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

71455890 is a wasteful number, since it uses less digits than its factorization.

71455890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 71455890 is about 8453.1585812642. The cubic root of 71455890 is about 414.9661558504.

The spelling of 71455890 in words is "seventy-one million, four hundred fifty-five thousand, eight hundred ninety".