63740521 has 16 divisors (see below), whose sum is σ = 74108160. Its totient is φ = 54331200.

The previous prime is 63740519. The next prime is 63740533. The reversal of 63740521 is 12504736.

It is a cyclic number.

It is not a de Polignac number, because 63740521 - 2¹ = 63740519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63740521.

It is not an unprimeable number, because it can be changed into a prime (63740581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4996 + ... + 12346.

It is an arithmetic number, because the mean of its divisors is an integer number (4631760).

Almost surely, 2^63740521 is an apocalyptic number.

It is an amenable number.

63740521 is a deficient number, since it is larger than the sum of its proper divisors (10367639).

63740521 is a wasteful number, since it uses less digits than its factorization.

63740521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7416.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 63740521 is about 7983.7660912629. The cubic root of 63740521 is about 399.4586865298.

It can be divided in two parts, 63740 and 521, that added together give a triangular number (64261 = T₃₅₈).

The spelling of 63740521 in words is "sixty-three million, seven hundred forty thousand, five hundred twenty-one".