681291870 has 32 divisors (see below), whose sum is σ = 1868686848. Its totient is φ = 155723808.

The previous prime is 681291869. The next prime is 681291889. The reversal of 681291870 is 78192186.

681291870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×681291870² = 928317224256193800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1621914 + ... + 1622333.

It is an arithmetic number, because the mean of its divisors is an integer number (58396464).

Almost surely, 2^681291870 is an apocalyptic number.

681291870 is an abundant number, since it is smaller than the sum of its proper divisors (1187394978).

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

681291870 is a wasteful number, since it uses less digits than its factorization.

681291870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3244264.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 681291870 is about 26101.5683436839. The cubic root of 681291870 is about 879.9224578714.

The spelling of 681291870 in words is "six hundred eighty-one million, two hundred ninety-one thousand, eight hundred seventy".