70637381 has 4 divisors (see below), whose sum is σ = 72140352. Its totient is φ = 69134412.

The previous prime is 70637321. The next prime is 70637387. The reversal of 70637381 is 18373607.

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 a cyclic number.

It is not a de Polignac number, because 70637381 - 2¹⁴ = 70620997 is a prime.

It is a super-2 number, since 2×70637381² = 9979279189078322, 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 (70637387) 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, 751415 + ... + 751508.

It is an arithmetic number, because the mean of its divisors is an integer number (18035088).

Almost surely, 2^70637381 is an apocalyptic number.

It is an amenable number.

70637381 is a deficient number, since it is larger than the sum of its proper divisors (1502971).

70637381 is a wasteful number, since it uses less digits than its factorization.

70637381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502970.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 70637381 is about 8404.6047497785. The cubic root of 70637381 is about 413.3756234189.

The spelling of 70637381 in words is "seventy million, six hundred thirty-seven thousand, three hundred eighty-one".