642497306 has 16 divisors (see below), whose sum is σ = 1077003648. Its totient is φ = 284920800.

The previous prime is 642497281. The next prime is 642497327. The reversal of 642497306 is 603794246.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355250 + ... + 357053.

It is an arithmetic number, because the mean of its divisors is an integer number (67312728).

Almost surely, 2^642497306 is an apocalyptic number.

642497306 is a deficient number, since it is larger than the sum of its proper divisors (434506342).

642497306 is a wasteful number, since it uses less digits than its factorization.

642497306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712357.

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 642497306 is about 25347.5305700575. The cubic root of 642497306 is about 862.8933134673.

The spelling of 642497306 in words is "six hundred forty-two million, four hundred ninety-seven thousand, three hundred six".