80651680 has 24 divisors (see below), whose sum is σ = 190539972. Its totient is φ = 32260608.

The previous prime is 80651657. The next prime is 80651693. The reversal of 80651680 is 8615608.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 75829264 + 4822416 = 8708^2 + 2196^2 .

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

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, 251877 + ... + 252196.

Almost surely, 2^80651680 is an apocalyptic number.

80651680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

80651680 is an abundant number, since it is smaller than the sum of its proper divisors (109888292).

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

80651680 is a wasteful number, since it uses less digits than its factorization.

80651680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504088 (or 504080 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 80651680 is about 8980.6280403990. The cubic root of 80651680 is about 432.0537770273.

The spelling of 80651680 in words is "eighty million, six hundred fifty-one thousand, six hundred eighty".