76540221 has 20 divisors (see below), whose sum is σ = 114998400. Its totient is φ = 50732136.

The previous prime is 76540207. The next prime is 76540223. The reversal of 76540221 is 12204567.

76540221 is a `hidden beast` number, since 7 + 654 + 0 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 76540221 - 2⁶ = 76540157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76540223) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11860 + ... + 17138.

It is an arithmetic number, because the mean of its divisors is an integer number (5749920).

Almost surely, 2^76540221 is an apocalyptic number.

It is an amenable number.

76540221 is a deficient number, since it is larger than the sum of its proper divisors (38458179).

76540221 is a wasteful number, since it uses less digits than its factorization.

76540221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5470 (or 5461 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 76540221 is about 8748.7268216581. The cubic root of 76540221 is about 424.5836217289.

Adding to 76540221 its reverse (12204567), we get a palindrome (88744788).

The spelling of 76540221 in words is "seventy-six million, five hundred forty thousand, two hundred twenty-one".