451378638 has 12 divisors (see below), whose sum is σ = 977987088. Its totient is φ = 150459540.

The previous prime is 451378621. The next prime is 451378639. The reversal of 451378638 is 836873154.

451378638 is a `hidden beast` number, since 4 + 5 + 1 + 3 + 7 + 8 + 638 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 451378593 and 451378602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451378639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12538278 + ... + 12538313.

It is an arithmetic number, because the mean of its divisors is an integer number (81498924).

Almost surely, 2^451378638 is an apocalyptic number.

451378638 is an abundant number, since it is smaller than the sum of its proper divisors (526608450).

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

451378638 is a wasteful number, since it uses less digits than its factorization.

451378638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25076599 (or 25076596 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 451378638 is about 21245.6733948350. The cubic root of 451378638 is about 767.0911999946.

The spelling of 451378638 in words is "four hundred fifty-one million, three hundred seventy-eight thousand, six hundred thirty-eight".