72781143 has 4 divisors (see below), whose sum is σ = 97041528. Its totient is φ = 48520760.

The previous prime is 72781133. The next prime is 72781157. The reversal of 72781143 is 34118727.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72781143 - 2¹⁶ = 72715607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72781103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12130188 + ... + 12130193.

It is an arithmetic number, because the mean of its divisors is an integer number (24260382).

Almost surely, 2^72781143 is an apocalyptic number.

72781143 is a deficient number, since it is larger than the sum of its proper divisors (24260385).

72781143 is a wasteful number, since it uses less digits than its factorization.

72781143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24260384.

The product of its digits is 9408, while the sum is 33.

The square root of 72781143 is about 8531.1864942691. The cubic root of 72781143 is about 417.5158405311.

The spelling of 72781143 in words is "seventy-two million, seven hundred eighty-one thousand, one hundred forty-three".