351422640 has 120 divisors (see below), whose sum is σ = 1249661088. Its totient is φ = 88197120.

The previous prime is 351422639. The next prime is 351422653. The reversal of 351422640 is 46224153.

351422640 is a `hidden beast` number, since 3 + 5 + 14 + 2 + 2 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2116 + ... + 26595.

Almost surely, 2^351422640 is an apocalyptic number.

351422640 is a gapful number since it is divisible by the number (30) 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 351422640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (624830544).

351422640 is an abundant number, since it is smaller than the sum of its proper divisors (898238448).

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

351422640 is a wasteful number, since it uses less digits than its factorization.

351422640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28747 (or 28738 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 351422640 is about 18746.2700289951. The cubic root of 351422640 is about 705.6834175677.

Adding to 351422640 its reverse (46224153), we get a palindrome (397646793).

The spelling of 351422640 in words is "three hundred fifty-one million, four hundred twenty-two thousand, six hundred forty".