70780631 has 4 divisors (see below), whose sum is σ = 71215032. Its totient is φ = 70346232.

The previous prime is 70780597. The next prime is 70780649. The reversal of 70780631 is 13608707.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 70780631 - 2¹⁴ = 70764247 is a prime.

It is a super-2 number, since 2×70780631² = 10019795449516322, 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 (70780691) 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, 216956 + ... + 217281.

It is an arithmetic number, because the mean of its divisors is an integer number (17803758).

Almost surely, 2^70780631 is an apocalyptic number.

70780631 is a deficient number, since it is larger than the sum of its proper divisors (434401).

70780631 is a wasteful number, since it uses less digits than its factorization.

70780631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434400.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 70780631 is about 8413.1225475444. The cubic root of 70780631 is about 413.6548715683.

The spelling of 70780631 in words is "seventy million, seven hundred eighty thousand, six hundred thirty-one".