628009440 has 48 divisors (see below), whose sum is σ = 1978231248. Its totient is φ = 167469056.

The previous prime is 628009433. The next prime is 628009469. The reversal of 628009440 is 44900826.

628009440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×628009440² = 788791713458227200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 653697 + ... + 654656.

It is an arithmetic number, because the mean of its divisors is an integer number (41213151).

Almost surely, 2^628009440 is an apocalyptic number.

628009440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

628009440 is an abundant number, since it is smaller than the sum of its proper divisors (1350221808).

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

628009440 is a wasteful number, since it uses less digits than its factorization.

628009440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308371 (or 1308363 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 628009440 is about 25060.1165200803. The cubic root of 628009440 is about 856.3580619827.

The spelling of 628009440 in words is "six hundred twenty-eight million, nine thousand, four hundred forty".