641262787 has 16 divisors (see below), whose sum is σ = 738777600. Its totient is φ = 550484640.

The previous prime is 641262781. The next prime is 641262803. The reversal of 641262787 is 787262146.

It is a cyclic number.

It is not a de Polignac number, because 641262787 - 2⁷ = 641262659 is a prime.

It is a super-2 number, since 2×641262787² = 822435923982014738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641262781) 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, 61414 + ... + 71092.

It is an arithmetic number, because the mean of its divisors is an integer number (46173600).

Almost surely, 2^641262787 is an apocalyptic number.

641262787 is a deficient number, since it is larger than the sum of its proper divisors (97514813).

641262787 is a wasteful number, since it uses less digits than its factorization.

641262787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10026.

The product of its digits is 225792, while the sum is 43.

The square root of 641262787 is about 25323.1670017792. The cubic root of 641262787 is about 862.3402936669.

The spelling of 641262787 in words is "six hundred forty-one million, two hundred sixty-two thousand, seven hundred eighty-seven".