642527380 has 24 divisors (see below), whose sum is σ = 1471972320. Its totient is φ = 233646240.

The previous prime is 642527377. The next prime is 642527381. The reversal of 642527380 is 83725246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642527381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1460070 + ... + 1460509.

It is an arithmetic number, because the mean of its divisors is an integer number (61332180).

Almost surely, 2^642527380 is an apocalyptic number.

It is an amenable number.

642527380 is an abundant number, since it is smaller than the sum of its proper divisors (829444940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642527380 is a wasteful number, since it uses less digits than its factorization.

642527380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920599 (or 2920597 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 642527380 is about 25348.1237964469. The cubic root of 642527380 is about 862.9067766878.

The spelling of 642527380 in words is "six hundred forty-two million, five hundred twenty-seven thousand, three hundred eighty".