421687266840 has 320 divisors, whose sum is σ = 1639337736960. Its totient is φ = 95223962880.

The previous prime is 421687266827. The next prime is 421687266841. The reversal of 421687266840 is 48662786124.

It is a happy number.

421687266840 is a `hidden beast` number, since 421 + 6 + 87 + 2 + 66 + 84 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421687266841) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1770435 + ... + 1994445.

It is an arithmetic number, because the mean of its divisors is an integer number (5122930428).

Almost surely, 2^421687266840 is an apocalyptic number.

421687266840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421687266840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (819668868480).

421687266840 is an abundant number, since it is smaller than the sum of its proper divisors (1217650470120).

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

421687266840 is a wasteful number, since it uses less digits than its factorization.

421687266840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224124 (or 224111 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 54.

The spelling of 421687266840 in words is "four hundred twenty-one billion, six hundred eighty-seven million, two hundred sixty-six thousand, eight hundred forty".