70840631 has 4 divisors (see below), whose sum is σ = 70992792. Its totient is φ = 70688472.

The previous prime is 70840613. The next prime is 70840657. The reversal of 70840631 is 13604807.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70840631 is a prime.

It is a super-2 number, since 2×70840631² = 10036790000956322, 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 = 70840594 and 70840603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70840691) 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, 75380 + ... + 76313.

It is an arithmetic number, because the mean of its divisors is an integer number (17748198).

Almost surely, 2^70840631 is an apocalyptic number.

70840631 is a deficient number, since it is larger than the sum of its proper divisors (152161).

70840631 is a wasteful number, since it uses less digits than its factorization.

70840631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152160.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 70840631 is about 8416.6876501389. The cubic root of 70840631 is about 413.7717221918.

The spelling of 70840631 in words is "seventy million, eight hundred forty thousand, six hundred thirty-one".