641423730 has 32 divisors (see below), whose sum is σ = 1554666048. Its totient is φ = 169352000.

The previous prime is 641423729. The next prime is 641423773. The reversal of 641423730 is 37324146.

It is a super-2 number, since 2×641423730² = 822848802814225800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102816 + ... + 108875.

It is an arithmetic number, because the mean of its divisors is an integer number (48583314).

Almost surely, 2^641423730 is an apocalyptic number.

641423730 is an abundant number, since it is smaller than the sum of its proper divisors (913242318).

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

641423730 is a wasteful number, since it uses less digits than its factorization.

641423730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211802.

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 641423730 is about 25326.3445842467. The cubic root of 641423730 is about 862.4124305129.

Adding to 641423730 its reverse (37324146), we get a palindrome (678747876).

The spelling of 641423730 in words is "six hundred forty-one million, four hundred twenty-three thousand, seven hundred thirty".