70621865 has 8 divisors (see below), whose sum is σ = 84793608. Its totient is φ = 56465920.

The previous prime is 70621861. The next prime is 70621883. The reversal of 70621865 is 56812607.

It can be written as a sum of positive squares in 4 ways, for example, as 5513104 + 65108761 = 2348^2 + 8069^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 70621865 - 2² = 70621861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70621861) 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 7 ways as a sum of consecutive naturals, for example, 11129 + ... + 16281.

It is an arithmetic number, because the mean of its divisors is an integer number (10599201).

Almost surely, 2^70621865 is an apocalyptic number.

It is an amenable number.

70621865 is a deficient number, since it is larger than the sum of its proper divisors (14171743).

70621865 is a wasteful number, since it uses less digits than its factorization.

70621865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7899.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 70621865 is about 8403.6816336651. The cubic root of 70621865 is about 413.3453542434.

The spelling of 70621865 in words is "seventy million, six hundred twenty-one thousand, eight hundred sixty-five".