628238784 has 28 divisors (see below), whose sum is σ = 1662215624. Its totient is φ = 209412864.

The previous prime is 628238761. The next prime is 628238789. The reversal of 628238784 is 487832826.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628238789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1635847 + ... + 1636230.

Almost surely, 2^628238784 is an apocalyptic number.

628238784 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

628238784 is an abundant number, since it is smaller than the sum of its proper divisors (1033976840).

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

628238784 is a wasteful number, since it uses less digits than its factorization.

628238784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3272092 (or 3272082 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 48.

The square root of 628238784 is about 25064.6919789572. The cubic root of 628238784 is about 856.4622943227.

The spelling of 628238784 in words is "six hundred twenty-eight million, two hundred thirty-eight thousand, seven hundred eighty-four".