1626666408 has 128 divisors (see below), whose sum is σ = 4600281600. Its totient is φ = 532512000.

The previous prime is 1626666359. The next prime is 1626666449. The reversal of 1626666408 is 8046666261.

1626666408 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3773953 + ... + 3774383.

It is an arithmetic number, because the mean of its divisors is an integer number (35939700).

Almost surely, 2^1626666408 is an apocalyptic number.

1626666408 is a gapful number since it is divisible by the number (18) 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 1626666408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2300140800).

1626666408 is an abundant number, since it is smaller than the sum of its proper divisors (2973615192).

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

1626666408 is a wasteful number, since it uses less digits than its factorization.

1626666408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 710 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 1626666408 is about 40331.9526926233. The cubic root of 1626666408 is about 1176.0690817394.

The spelling of 1626666408 in words is "one billion, six hundred twenty-six million, six hundred sixty-six thousand, four hundred eight".