70387631 has 4 divisors (see below), whose sum is σ = 70609992. Its totient is φ = 70165272.

The previous prime is 70387619. The next prime is 70387637. The reversal of 70387631 is 13678307.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13678307 = 23 ⋅594709.

It is a cyclic number.

It is not a de Polignac number, because 70387631 - 2¹⁸ = 70125487 is a prime.

It is a super-2 number, since 2×70387631² = 9908837195584322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70387591 and 70387600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70387637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110705 + ... + 111338.

It is an arithmetic number, because the mean of its divisors is an integer number (17652498).

Almost surely, 2^70387631 is an apocalyptic number.

70387631 is a deficient number, since it is larger than the sum of its proper divisors (222361).

70387631 is a wasteful number, since it uses less digits than its factorization.

70387631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222360.

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

The square root of 70387631 is about 8389.7336668097. The cubic root of 70387631 is about 412.8878624314.

The spelling of 70387631 in words is "seventy million, three hundred eighty-seven thousand, six hundred thirty-one".