72920042 has 8 divisors (see below), whose sum is σ = 117793956. Its totient is φ = 33655392.

The previous prime is 72920039. The next prime is 72920059. The reversal of 72920042 is 24002927.

It can be written as a sum of positive squares in 2 ways, for example, as 72403081 + 516961 = 8509^2 + 719^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×72920042³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 2804617 = 72920042 / (7 + 2 + 9 + 2 + 0 + 0 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 72919993 and 72920020.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1402283 + ... + 1402334.

Almost surely, 2^72920042 is an apocalyptic number.

72920042 is a deficient number, since it is larger than the sum of its proper divisors (44873914).

72920042 is a wasteful number, since it uses less digits than its factorization.

72920042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2804632.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 72920042 is about 8539.3232752953. The cubic root of 72920042 is about 417.7812741196.

Adding to 72920042 its reverse (24002927), we get a palindrome (96922969).

The spelling of 72920042 in words is "seventy-two million, nine hundred twenty thousand, forty-two".