70550721 has 6 divisors (see below), whose sum is σ = 101906610. Its totient is φ = 47033808.

The previous prime is 70550693. The next prime is 70550797. The reversal of 70550721 is 12705507.

It can be written as a sum of positive squares in only one way, i.e., 52403121 + 18147600 = 7239^2 + 4260^2 .

It is not a de Polignac number, because 70550721 - 2⁶ = 70550657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70550521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3919476 + ... + 3919493.

It is an arithmetic number, because the mean of its divisors is an integer number (16984435).

Almost surely, 2^70550721 is an apocalyptic number.

It is an amenable number.

70550721 is a deficient number, since it is larger than the sum of its proper divisors (31355889).

70550721 is a wasteful number, since it uses less digits than its factorization.

70550721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7838975 (or 7838972 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 27.

The square root of 70550721 is about 8399.4476604120. The cubic root of 70550721 is about 413.2065071492.

The spelling of 70550721 in words is "seventy million, five hundred fifty thousand, seven hundred twenty-one".