680551812 has 36 divisors (see below), whose sum is σ = 1733427696. Its totient is φ = 225117360.

The previous prime is 680551811. The next prime is 680551813. The reversal of 680551812 is 218155086.

It is an interprime number because it is at equal distance from previous prime (680551811) and next prime (680551813).

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (680551811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67438 + ... + 76869.

Almost surely, 2^680551812 is an apocalyptic number.

It is an amenable number.

680551812 is an abundant number, since it is smaller than the sum of its proper divisors (1052875884).

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

680551812 is a wasteful number, since it uses less digits than its factorization.

680551812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144448 (or 144443 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The square root of 680551812 is about 26087.3879873015. The cubic root of 680551812 is about 879.6037351558.

It can be divided in two parts, 68055 and 1812, that multiplied together give a triangular number (123315660 = T₁₅₇₀₄).

The spelling of 680551812 in words is "six hundred eighty million, five hundred fifty-one thousand, eight hundred twelve".