420045720 has 32 divisors (see below), whose sum is σ = 1260137520. Its totient is φ = 112012160.

The previous prime is 420045709. The next prime is 420045733. The reversal of 420045720 is 27540024.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1750071 + ... + 1750310.

Almost surely, 2^420045720 is an apocalyptic number.

420045720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420045720 is an abundant number, since it is smaller than the sum of its proper divisors (840091800).

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

420045720 is a wasteful number, since it uses less digits than its factorization.

420045720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500395 (or 3500391 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 420045720 is about 20495.0169553480. The cubic root of 420045720 is about 748.9144116443.

Adding to 420045720 its reverse (27540024), we get a palindrome (447585744).

The spelling of 420045720 in words is "four hundred twenty million, forty-five thousand, seven hundred twenty".