642105380 has 48 divisors (see below), whose sum is σ = 1622167680. Its totient is φ = 208562688.

The previous prime is 642105377. The next prime is 642105383. The reversal of 642105380 is 83501246.

It is an interprime number because it is at equal distance from previous prime (642105377) and next prime (642105383).

It is not an unprimeable number, because it can be changed into a prime (642105383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118037 + ... + 123356.

It is an arithmetic number, because the mean of its divisors is an integer number (33795160).

Almost surely, 2^642105380 is an apocalyptic number.

It is an amenable number.

642105380 is an abundant number, since it is smaller than the sum of its proper divisors (980062300).

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

642105380 is a wasteful number, since it uses less digits than its factorization.

642105380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241428 (or 241426 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 642105380 is about 25339.7983417390. The cubic root of 642105380 is about 862.7178216218.

The spelling of 642105380 in words is "six hundred forty-two million, one hundred five thousand, three hundred eighty".