72784061 has 12 divisors (see below), whose sum is σ = 86734620. Its totient is φ = 60863040.

The previous prime is 72784057. The next prime is 72784067. The reversal of 72784061 is 16048727.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17935225 + 54848836 = 4235^2 + 7406^2 .

It is not a de Polignac number, because 72784061 - 2² = 72784057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72784067) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16106 + ... + 20123.

It is an arithmetic number, because the mean of its divisors is an integer number (7227885).

Almost surely, 2^72784061 is an apocalyptic number.

It is an amenable number.

72784061 is a deficient number, since it is larger than the sum of its proper divisors (13950559).

72784061 is a wasteful number, since it uses less digits than its factorization.

72784061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36284 (or 36277 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 72784061 is about 8531.3575121431. The cubic root of 72784061 is about 417.5214202499.

The spelling of 72784061 in words is "seventy-two million, seven hundred eighty-four thousand, sixty-one".