72545420 has 24 divisors (see below), whose sum is σ = 160364400. Its totient is φ = 27490752.

The previous prime is 72545399. The next prime is 72545449. The reversal of 72545420 is 2454527.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95075 + ... + 95834.

It is an arithmetic number, because the mean of its divisors is an integer number (6681850).

Almost surely, 2^72545420 is an apocalyptic number.

It is an amenable number.

72545420 is an abundant number, since it is smaller than the sum of its proper divisors (87818980).

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

72545420 is a wasteful number, since it uses less digits than its factorization.

72545420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190937 (or 190935 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 72545420 is about 8517.3599195995. The cubic root of 72545420 is about 417.0646040069.

Adding to 72545420 its reverse (2454527), we get a palindrome (74999947).

The spelling of 72545420 in words is "seventy-two million, five hundred forty-five thousand, four hundred twenty".