72543550 has 12 divisors (see below), whose sum is σ = 134931096. Its totient is φ = 29017400.

The previous prime is 72543511. The next prime is 72543563. The reversal of 72543550 is 5534527.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 725386 + ... + 725485.

It is an arithmetic number, because the mean of its divisors is an integer number (11244258).

Almost surely, 2^72543550 is an apocalyptic number.

72543550 is a deficient number, since it is larger than the sum of its proper divisors (62387546).

72543550 is a wasteful number, since it uses less digits than its factorization.

72543550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450883 (or 1450878 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 31.

The square root of 72543550 is about 8517.2501430920. The cubic root of 72543550 is about 417.0610204243.

The spelling of 72543550 in words is "seventy-two million, five hundred forty-three thousand, five hundred fifty".