72253040 has 20 divisors (see below), whose sum is σ = 167988504. Its totient is φ = 28901184.

The previous prime is 72253037. The next prime is 72253057. The reversal of 72253040 is 4035227.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 72252997 and 72253015.

It is a congruent number.

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, 451502 + ... + 451661.

Almost surely, 2^72253040 is an apocalyptic number.

It is an amenable number.

72253040 is an abundant number, since it is smaller than the sum of its proper divisors (95735464).

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

72253040 is a wasteful number, since it uses less digits than its factorization.

72253040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903176 (or 903170 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 72253040 is about 8500.1788216484. The cubic root of 72253040 is about 416.5035507298.

Adding to 72253040 its reverse (4035227), we get a palindrome (76288267).

The spelling of 72253040 in words is "seventy-two million, two hundred fifty-three thousand, forty".