4020626640 has 80 divisors (see below), whose sum is σ = 12699151488. Its totient is φ = 1051934208.

The previous prime is 4020626639. The next prime is 4020626657. The reversal of 4020626640 is 466260204.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 4020626598 and 4020626607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145324 + ... + 170763.

Almost surely, 2^4020626640 is an apocalyptic number.

4020626640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4020626640 is an abundant number, since it is smaller than the sum of its proper divisors (8678524848).

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

4020626640 is a wasteful number, since it uses less digits than its factorization.

4020626640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316156 (or 316150 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 4020626640 is about 63408.4114293995. The cubic root of 4020626640 is about 1590.1249377716.

Adding to 4020626640 its reverse (466260204), we get a palindrome (4486886844).

The spelling of 4020626640 in words is "four billion, twenty million, six hundred twenty-six thousand, six hundred forty".