681415402 has 16 divisors (see below), whose sum is σ = 1060416000. Its totient is φ = 328054320.

The previous prime is 681415337. The next prime is 681415409. The reversal of 681415402 is 204514186.

681415402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (681415409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15277 + ... + 39952.

It is an arithmetic number, because the mean of its divisors is an integer number (66276000).

Almost surely, 2^681415402 is an apocalyptic number.

681415402 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

681415402 is a deficient number, since it is larger than the sum of its proper divisors (379000598).

681415402 is a wasteful number, since it uses less digits than its factorization.

681415402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55461.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 681415402 is about 26103.9346076410. The cubic root of 681415402 is about 879.9756372387.

Adding to 681415402 its reverse (204514186), we get a palindrome (885929588).

The spelling of 681415402 in words is "six hundred eighty-one million, four hundred fifteen thousand, four hundred two".