70987917 has 72 divisors (see below), whose sum is σ = 130757088. Its totient is φ = 33929280.

The previous prime is 70987897. The next prime is 70987919. The reversal of 70987917 is 71978907.

It is not a de Polignac number, because 70987917 - 2⁷ = 70987789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70987919) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 231078 + ... + 231384.

Almost surely, 2^70987917 is an apocalyptic number.

70987917 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

70987917 is a deficient number, since it is larger than the sum of its proper divisors (59769171).

70987917 is a wasteful number, since it uses less digits than its factorization.

70987917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 48.

The square root of 70987917 is about 8425.4327485299. The cubic root of 70987917 is about 414.0582837031.

The spelling of 70987917 in words is "seventy million, nine hundred eighty-seven thousand, nine hundred seventeen".