70121636 has 12 divisors (see below), whose sum is σ = 132152412. Its totient is φ = 32363808.

The previous prime is 70121633. The next prime is 70121671. The reversal of 70121636 is 63612107.

It can be written as a sum of positive squares in 2 ways, for example, as 15952036 + 54169600 = 3994^2 + 7360^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (70121633) 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, 674195 + ... + 674298.

It is an arithmetic number, because the mean of its divisors is an integer number (11012701).

Almost surely, 2^70121636 is an apocalyptic number.

It is an amenable number.

70121636 is a deficient number, since it is larger than the sum of its proper divisors (62030776).

70121636 is a wasteful number, since it uses less digits than its factorization.

70121636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348510 (or 1348508 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 70121636 is about 8373.8662516188. The cubic root of 70121636 is about 412.3671045419.

The spelling of 70121636 in words is "seventy million, one hundred twenty-one thousand, six hundred thirty-six".