71490780 has 144 divisors (see below), whose sum is σ = 233985024. Its totient is φ = 17602560.

The previous prime is 71490779. The next prime is 71490803. The reversal of 71490780 is 8709417.

It is a super-2 number, since 2×71490780² = 10221863250016800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 186469 + ... + 186851.

It is an arithmetic number, because the mean of its divisors is an integer number (1624896).

Almost surely, 2^71490780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71490780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116992512).

71490780 is an abundant number, since it is smaller than the sum of its proper divisors (162494244).

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

71490780 is a wasteful number, since it uses less digits than its factorization.

71490780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 71490780 is about 8455.2220550379. Note that the first 3 decimals coincide. The cubic root of 71490780 is about 415.0336838194.

The spelling of 71490780 in words is "seventy-one million, four hundred ninety thousand, seven hundred eighty".