640062403 has 8 divisors (see below), whose sum is σ = 657603072. Its totient is φ = 622685256.

The previous prime is 640062391. The next prime is 640062413. The reversal of 640062403 is 304260046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640062403 - 2¹³ = 640054211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640062413) 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, 32925 + ... + 48622.

It is an arithmetic number, because the mean of its divisors is an integer number (82200384).

Almost surely, 2^640062403 is an apocalyptic number.

640062403 is a deficient number, since it is larger than the sum of its proper divisors (17540669).

640062403 is a wasteful number, since it uses less digits than its factorization.

640062403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81761.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 640062403 is about 25299.4545988644. The cubic root of 640062403 is about 861.8018841000.

The spelling of 640062403 in words is "six hundred forty million, sixty-two thousand, four hundred three".