647699400 has 144 divisors (see below), whose sum is σ = 2190514560. Its totient is φ = 171504000.

The previous prime is 647699387. The next prime is 647699401. The reversal of 647699400 is 4996746.

647699400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (647699401) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 270609 + ... + 272991.

Almost surely, 2^647699400 is an apocalyptic number.

647699400 is a gapful number since it is divisible by the number (60) 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 647699400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1095257280).

647699400 is an abundant number, since it is smaller than the sum of its proper divisors (1542815160).

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

647699400 is a wasteful number, since it uses less digits than its factorization.

647699400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556 (or 2544 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 647699400 is about 25449.9390961943. The cubic root of 647699400 is about 865.2159127782.

The spelling of 647699400 in words is "six hundred forty-seven million, six hundred ninety-nine thousand, four hundred".