72543654 has 64 divisors (see below), whose sum is σ = 166855680. Its totient is φ = 23349600.

The previous prime is 72543619. The next prime is 72543661. The reversal of 72543654 is 45634527.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 256197 + ... + 256479.

It is an arithmetic number, because the mean of its divisors is an integer number (2607120).

Almost surely, 2^72543654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72543654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83427840).

72543654 is an abundant number, since it is smaller than the sum of its proper divisors (94312026).

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

72543654 is a wasteful number, since it uses less digits than its factorization.

72543654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442 (or 436 counting only the distinct ones).

The product of its digits is 100800, while the sum is 36.

The square root of 72543654 is about 8517.2562483466. The cubic root of 72543654 is about 417.0612197268.

The spelling of 72543654 in words is "seventy-two million, five hundred forty-three thousand, six hundred fifty-four".