681453590 has 16 divisors (see below), whose sum is σ = 1227305088. Its totient is φ = 272428416.

The previous prime is 681453587. The next prime is 681453593. The reversal of 681453590 is 95354186.

It is an interprime number because it is at equal distance from previous prime (681453587) and next prime (681453593).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681453593) 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, 539 + ... + 36921.

It is an arithmetic number, because the mean of its divisors is an integer number (76706568).

Almost surely, 2^681453590 is an apocalyptic number.

681453590 is a deficient number, since it is larger than the sum of its proper divisors (545851498).

681453590 is a wasteful number, since it uses less digits than its factorization.

681453590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38263.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 681453590 is about 26104.6660580058. Note that the first 3 decimals coincide. The cubic root of 681453590 is about 879.9920755140.

The spelling of 681453590 in words is "six hundred eighty-one million, four hundred fifty-three thousand, five hundred ninety".