71780680 has 16 divisors (see below), whose sum is σ = 161506620. Its totient is φ = 28712256.

The previous prime is 71780659. The next prime is 71780699. The reversal of 71780680 is 8608717.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 70257924 + 1522756 = 8382^2 + 1234^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897219 + ... + 897298.

Almost surely, 2^71780680 is an apocalyptic number.

It is an amenable number.

71780680 is an abundant number, since it is smaller than the sum of its proper divisors (89725940).

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

71780680 is a wasteful number, since it uses less digits than its factorization.

71780680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794528 (or 1794524 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 71780680 is about 8472.3479626370. The cubic root of 71780680 is about 415.5939238830.

The spelling of 71780680 in words is "seventy-one million, seven hundred eighty thousand, six hundred eighty".