641478730 has 32 divisors (see below), whose sum is σ = 1188722304. Its totient is φ = 249095616.

The previous prime is 641478727. The next prime is 641478737. The reversal of 641478730 is 37874146.

It is a super-2 number, since 2×641478730² = 822989922084825800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641478737) 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, 67344 + ... + 76276.

It is an arithmetic number, because the mean of its divisors is an integer number (37147572).

Almost surely, 2^641478730 is an apocalyptic number.

641478730 is a deficient number, since it is larger than the sum of its proper divisors (547243574).

641478730 is a wasteful number, since it uses less digits than its factorization.

641478730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9150.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 641478730 is about 25327.4303868355. The cubic root of 641478730 is about 862.4370794960.

The spelling of 641478730 in words is "six hundred forty-one million, four hundred seventy-eight thousand, seven hundred thirty".