72887481 has 12 divisors (see below), whose sum is σ = 105544660. Its totient is φ = 48470400.

The previous prime is 72887473. The next prime is 72887501. The reversal of 72887481 is 18478827.

It can be written as a sum of positive squares in 2 ways, for example, as 26101881 + 46785600 = 5109^2 + 6840^2 .

It is not a de Polignac number, because 72887481 - 2³ = 72887473 is a prime.

It is a super-2 number, since 2×72887481² = 10625169773050722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72887431) 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, 6220 + ... + 13581.

Almost surely, 2^72887481 is an apocalyptic number.

It is an amenable number.

72887481 is a deficient number, since it is larger than the sum of its proper divisors (32657179).

72887481 is a wasteful number, since it uses less digits than its factorization.

72887481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20216 (or 20213 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 72887481 is about 8537.4165296066. The cubic root of 72887481 is about 417.7190808782.

It can be divided in two parts, 728 and 87481, that added together give a square (88209 = 297²).

The spelling of 72887481 in words is "seventy-two million, eight hundred eighty-seven thousand, four hundred eighty-one".