642530370 has 16 divisors (see below), whose sum is σ = 1542072960. Its totient is φ = 171341424.

The previous prime is 642530321. The next prime is 642530401. The reversal of 642530370 is 73035246.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 21417679 = 642530370 / (6 + 4 + 2 + 5 + 3 + 0 + 3 + 7 + 0).

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, 10708810 + ... + 10708869.

It is an arithmetic number, because the mean of its divisors is an integer number (96379560).

Almost surely, 2^642530370 is an apocalyptic number.

642530370 is an abundant number, since it is smaller than the sum of its proper divisors (899542590).

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

642530370 is a wasteful number, since it uses less digits than its factorization.

642530370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21417689.

The product of its (nonzero) digits is 15120, while the sum is 30.

The square root of 642530370 is about 25348.1827751024. The cubic root of 642530370 is about 862.9081151974.

The spelling of 642530370 in words is "six hundred forty-two million, five hundred thirty thousand, three hundred seventy".