72290426 has 48 divisors (see below), whose sum is σ = 129968064. Its totient is φ = 29981952.

The previous prime is 72290423. The next prime is 72290431. The reversal of 72290426 is 62409227.

It is a super-3 number, since 3×72290426³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72290392 and 72290401.

It is not an unprimeable number, because it can be changed into a prime (72290423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131885 + ... + 132431.

It is an arithmetic number, because the mean of its divisors is an integer number (2707668).

Almost surely, 2^72290426 is an apocalyptic number.

72290426 is a deficient number, since it is larger than the sum of its proper divisors (57677638).

72290426 is a wasteful number, since it uses less digits than its factorization.

72290426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 72290426 is about 8502.3776674528. The cubic root of 72290426 is about 416.5753756975.

The spelling of 72290426 in words is "seventy-two million, two hundred ninety thousand, four hundred twenty-six".