70237521 has 12 divisors (see below), whose sum is σ = 102460020. Its totient is φ = 46360800.

The previous prime is 70237511. The next prime is 70237543. The reversal of 70237521 is 12573207.

It can be written as a sum of positive squares in 2 ways, for example, as 58064400 + 12173121 = 7620^2 + 3489^2 .

It is not a de Polignac number, because 70237521 - 2⁶ = 70237457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70237501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37726 + ... + 39543.

It is an arithmetic number, because the mean of its divisors is an integer number (8538335).

Almost surely, 2^70237521 is an apocalyptic number.

It is an amenable number.

70237521 is a deficient number, since it is larger than the sum of its proper divisors (32222499).

70237521 is a wasteful number, since it uses less digits than its factorization.

70237521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77376 (or 77373 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 70237521 is about 8380.7828393295. The cubic root of 70237521 is about 412.5941427000.

The spelling of 70237521 in words is "seventy million, two hundred thirty-seven thousand, five hundred twenty-one".