63740691 has 24 divisors (see below), whose sum is σ = 107793504. Its totient is φ = 35533440.

The previous prime is 63740689. The next prime is 63740717. The reversal of 63740691 is 19604736.

It is not a de Polignac number, because 63740691 - 2¹ = 63740689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63740671) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9756 + ... + 14921.

It is an arithmetic number, because the mean of its divisors is an integer number (4491396).

Almost surely, 2^63740691 is an apocalyptic number.

63740691 is a deficient number, since it is larger than the sum of its proper divisors (44052813).

63740691 is a wasteful number, since it uses less digits than its factorization.

63740691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24731 (or 24728 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 63740691 is about 7983.7767378603. The cubic root of 63740691 is about 399.4590416566.

It can be divided in two parts, 637 and 40691, that added together give a triangular number (41328 = T₂₈₇).

The spelling of 63740691 in words is "sixty-three million, seven hundred forty thousand, six hundred ninety-one".