70790921 has 4 divisors (see below), whose sum is σ = 71060352. Its totient is φ = 70521492.

The previous prime is 70790911. The next prime is 70790939. The reversal of 70790921 is 12909707.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12909707 = 37 ⋅348911.

It is a cyclic number.

It is not a de Polignac number, because 70790921 - 2¹⁰ = 70789897 is a prime.

It is a super-2 number, since 2×70790921² = 10022708992056482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70790911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134321 + ... + 134846.

It is an arithmetic number, because the mean of its divisors is an integer number (17765088).

Almost surely, 2^70790921 is an apocalyptic number.

It is an amenable number.

70790921 is a deficient number, since it is larger than the sum of its proper divisors (269431).

70790921 is a wasteful number, since it uses less digits than its factorization.

70790921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269430.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 70790921 is about 8413.7340699597. The cubic root of 70790921 is about 413.6749161404.

The spelling of 70790921 in words is "seventy million, seven hundred ninety thousand, nine hundred twenty-one".