420691280 has 40 divisors (see below), whose sum is σ = 980943912. Its totient is φ = 167788544.

The previous prime is 420691279. The next prime is 420691301. The reversal of 420691280 is 82196024.

It can be written as a sum of positive squares in 4 ways, for example, as 109662784 + 311028496 = 10472^2 + 17636^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20792 + ... + 35688.

Almost surely, 2^420691280 is an apocalyptic number.

420691280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420691280 is an abundant number, since it is smaller than the sum of its proper divisors (560252632).

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

420691280 is a wasteful number, since it uses less digits than its factorization.

420691280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15263 (or 15257 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 420691280 is about 20510.7601029313. The cubic root of 420691280 is about 749.2978792033.

The spelling of 420691280 in words is "four hundred twenty million, six hundred ninety-one thousand, two hundred eighty".