663401400 has 48 divisors (see below), whose sum is σ = 2056546200. Its totient is φ = 176906880.

The previous prime is 663401399. The next prime is 663401411. The reversal of 663401400 is 4104366.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 552235 + ... + 553434.

Almost surely, 2^663401400 is an apocalyptic number.

663401400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

663401400 is an abundant number, since it is smaller than the sum of its proper divisors (1393144800).

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

663401400 is a wasteful number, since it uses less digits than its factorization.

663401400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105688 (or 1105679 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 663401400 is about 25756.5797418834. The cubic root of 663401400 is about 872.1518932720.

Adding to 663401400 its reverse (4104366), we get a palindrome (667505766).

The spelling of 663401400 in words is "six hundred sixty-three million, four hundred one thousand, four hundred".