72781010 has 16 divisors (see below), whose sum is σ = 135523800. Its totient is φ = 28108416.

The previous prime is 72781003. The next prime is 72781013. The reversal of 72781010 is 1018727.

It can be written as a sum of positive squares in 4 ways, for example, as 45144961 + 27636049 = 6719^2 + 5257^2 .

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

It is not an unprimeable number, because it can be changed into a prime (72781013) 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, 125195 + ... + 125774.

Almost surely, 2^72781010 is an apocalyptic number.

72781010 is a deficient number, since it is larger than the sum of its proper divisors (62742790).

72781010 is a wasteful number, since it uses less digits than its factorization.

72781010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251005.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 72781010 is about 8531.1786993357. The cubic root of 72781010 is about 417.5155862086.

Adding to 72781010 its reverse (1018727), we get a palindrome (73799737).

The spelling of 72781010 in words is "seventy-two million, seven hundred eighty-one thousand, ten".