42720723 has 16 divisors (see below), whose sum is σ = 63616000. Its totient is φ = 28333800.

The previous prime is 42720709. The next prime is 42720737. The reversal of 42720723 is 32702724.

It is an interprime number because it is at equal distance from previous prime (42720709) and next prime (42720737).

It is not a de Polignac number, because 42720723 - 2⁶ = 42720659 is a prime.

It is a super-5 number, since 5×42720723⁵ (a number of 39 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42720323) 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, 1398 + ... + 9348.

It is an arithmetic number, because the mean of its divisors is an integer number (3976000).

Almost surely, 2^42720723 is an apocalyptic number.

42720723 is a deficient number, since it is larger than the sum of its proper divisors (20895277).

42720723 is a wasteful number, since it uses less digits than its factorization.

42720723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8159 (or 8153 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 27.

The square root of 42720723 is about 6536.1091637151. The cubic root of 42720723 is about 349.5796941071.

The spelling of 42720723 in words is "forty-two million, seven hundred twenty thousand, seven hundred twenty-three".