408620640 has 48 divisors (see below), whose sum is σ = 1287156528. Its totient is φ = 108965376.

The previous prime is 408620633. The next prime is 408620651. The reversal of 408620640 is 46026804.

It is a tau number, because it is divible by the number of its divisors (48).

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 = 408620598 and 408620607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425167 + ... + 426126.

It is an arithmetic number, because the mean of its divisors is an integer number (26815761).

Almost surely, 2^408620640 is an apocalyptic number.

408620640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

408620640 is an abundant number, since it is smaller than the sum of its proper divisors (878535888).

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

408620640 is a wasteful number, since it uses less digits than its factorization.

408620640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851311 (or 851303 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 408620640 is about 20214.3671679328. The cubic root of 408620640 is about 742.0618417275.

The spelling of 408620640 in words is "four hundred eight million, six hundred twenty thousand, six hundred forty".