70639537 has 2 divisors, whose sum is σ = 70639538. Its totient is φ = 70639536.

The previous prime is 70639469. The next prime is 70639553. The reversal of 70639537 is 73593607.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70627216 + 12321 = 8404^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 70639537 - 2¹⁵ = 70606769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70639537.

It is not a weakly prime, because it can be changed into another prime (70631537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35319768 + 35319769.

It is an arithmetic number, because the mean of its divisors is an integer number (35319769).

Almost surely, 2^70639537 is an apocalyptic number.

It is an amenable number.

70639537 is a deficient number, since it is larger than the sum of its proper divisors (1).

70639537 is an equidigital number, since it uses as much as digits as its factorization.

70639537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 119070, while the sum is 40.

The square root of 70639537 is about 8404.7330118214. The cubic root of 70639537 is about 413.3798290712.

The spelling of 70639537 in words is "seventy million, six hundred thirty-nine thousand, five hundred thirty-seven".