70720051 has 4 divisors (see below), whose sum is σ = 74880072. Its totient is φ = 66560032.

The previous prime is 70720049. The next prime is 70720057. The reversal of 70720051 is 15002707.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15002707 = 67 ⋅223921.

It is not a de Polignac number, because 70720051 - 2¹ = 70720049 is a prime.

It is a super-2 number, since 2×70720051² = 10002651226885202, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70720057) 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, 2079985 + ... + 2080018.

It is an arithmetic number, because the mean of its divisors is an integer number (18720018).

Almost surely, 2^70720051 is an apocalyptic number.

70720051 is a deficient number, since it is larger than the sum of its proper divisors (4160021).

70720051 is a wasteful number, since it uses less digits than its factorization.

70720051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160020.

The product of its (nonzero) digits is 490, while the sum is 22.

The square root of 70720051 is about 8409.5214489292. The cubic root of 70720051 is about 413.5368243737.

Adding to 70720051 its reverse (15002707), we get a palindrome (85722758).

The spelling of 70720051 in words is "seventy million, seven hundred twenty thousand, fifty-one".