681465420 has 48 divisors (see below), whose sum is σ = 2120116320. Its totient is φ = 181723968.

The previous prime is 681465409. The next prime is 681465443. The reversal of 681465420 is 24564186.

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

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, 630447 + ... + 631526.

It is an arithmetic number, because the mean of its divisors is an integer number (44169090).

Almost surely, 2^681465420 is an apocalyptic number.

681465420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681465420 is an abundant number, since it is smaller than the sum of its proper divisors (1438650900).

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

681465420 is a wasteful number, since it uses less digits than its factorization.

681465420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261991 (or 1261983 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 681465420 is about 26104.8926448664. The cubic root of 681465420 is about 879.9971676906.

The spelling of 681465420 in words is "six hundred eighty-one million, four hundred sixty-five thousand, four hundred twenty".