72154840 has 32 divisors (see below), whose sum is σ = 163302480. Its totient is φ = 28692352.

The previous prime is 72154829. The next prime is 72154843. The reversal of 72154840 is 4845127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72154843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1707 + ... + 12133.

Almost surely, 2^72154840 is an apocalyptic number.

It is an amenable number.

72154840 is an abundant number, since it is smaller than the sum of its proper divisors (91147640).

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

72154840 is a wasteful number, since it uses less digits than its factorization.

72154840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611 (or 10607 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 72154840 is about 8494.4005085703. The cubic root of 72154840 is about 416.3147734723.

Adding to 72154840 its reverse (4845127), we get a palindrome (76999967).

The spelling of 72154840 in words is "seventy-two million, one hundred fifty-four thousand, eight hundred forty".