42420720 has 40 divisors (see below), whose sum is σ = 131504976. Its totient is φ = 11312128.

The previous prime is 42420701. The next prime is 42420727. The reversal of 42420720 is 2702424.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42420727) 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, 88137 + ... + 88616.

Almost surely, 2^42420720 is an apocalyptic number.

42420720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42420720 is an abundant number, since it is smaller than the sum of its proper divisors (89084256).

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

42420720 is a wasteful number, since it uses less digits than its factorization.

42420720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176769 (or 176763 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 21.

The square root of 42420720 is about 6513.1190684648. The cubic root of 42420720 is about 348.7594722572.

The spelling of 42420720 in words is "forty-two million, four hundred twenty thousand, seven hundred twenty".