700128381 has 4 divisors (see below), whose sum is σ = 933504512. Its totient is φ = 466752252.

The previous prime is 700128343. The next prime is 700128409. The reversal of 700128381 is 183821007.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 700128381 - 2¹¹ = 700126333 is a prime.

It is a super-2 number, since 2×700128381² = 980359499763362322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (700128301) 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, 116688061 + ... + 116688066.

It is an arithmetic number, because the mean of its divisors is an integer number (233376128).

Almost surely, 2^700128381 is an apocalyptic number.

It is an amenable number.

700128381 is a deficient number, since it is larger than the sum of its proper divisors (233376131).

700128381 is a wasteful number, since it uses less digits than its factorization.

700128381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233376130.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 700128381 is about 26459.9391722657. The cubic root of 700128381 is about 887.9582793787.

Adding to 700128381 its reverse (183821007), we get a palindrome (883949388).

The spelling of 700128381 in words is "seven hundred million, one hundred twenty-eight thousand, three hundred eighty-one".