405020680 has 64 divisors (see below), whose sum is σ = 926821440. Its totient is φ = 159274752.

The previous prime is 405020677. The next prime is 405020683. The reversal of 405020680 is 86020504.

It is an interprime number because it is at equal distance from previous prime (405020677) and next prime (405020683).

It is not an unprimeable number, because it can be changed into a prime (405020683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 740167 + ... + 740713.

It is an arithmetic number, because the mean of its divisors is an integer number (14481585).

Almost surely, 2^405020680 is an apocalyptic number.

405020680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

405020680 is an abundant number, since it is smaller than the sum of its proper divisors (521800760).

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

405020680 is a wasteful number, since it uses less digits than its factorization.

405020680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838 (or 834 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 405020680 is about 20125.1255896702. The cubic root of 405020680 is about 739.8762149899.

The spelling of 405020680 in words is "four hundred five million, twenty thousand, six hundred eighty".