421647864 has 64 divisors (see below), whose sum is σ = 1187066880. Its totient is φ = 123648000.

The previous prime is 421647859. The next prime is 421647869. The reversal of 421647864 is 468746124.

It is an interprime number because it is at equal distance from previous prime (421647859) and next prime (421647869).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421647869) 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, 17577 + ... + 33944.

It is an arithmetic number, because the mean of its divisors is an integer number (18547920).

Almost surely, 2^421647864 is an apocalyptic number.

421647864 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

421647864 is an abundant number, since it is smaller than the sum of its proper divisors (765419016).

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

421647864 is a wasteful number, since it uses less digits than its factorization.

421647864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51572 (or 51568 counting only the distinct ones).

The product of its digits is 258048, while the sum is 42.

The square root of 421647864 is about 20534.0659393117. The cubic root of 421647864 is about 749.8653767258.

The spelling of 421647864 in words is "four hundred twenty-one million, six hundred forty-seven thousand, eight hundred sixty-four".