70624639 has 2 divisors, whose sum is σ = 70624640. Its totient is φ = 70624638.

The previous prime is 70624621. The next prime is 70624643. The reversal of 70624639 is 93642607.

It is a strong prime.

It is an emirp because it is prime and its reverse (93642607) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70624639 - 2¹⁷ = 70493567 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 70624598 and 70624607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70624669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35312319 + 35312320.

It is an arithmetic number, because the mean of its divisors is an integer number (35312320).

Almost surely, 2^70624639 is an apocalyptic number.

70624639 is a deficient number, since it is larger than the sum of its proper divisors (1).

70624639 is an equidigital number, since it uses as much as digits as its factorization.

70624639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 70624639 is about 8403.8466787537. The cubic root of 70624639 is about 413.3507661887.

The spelling of 70624639 in words is "seventy million, six hundred twenty-four thousand, six hundred thirty-nine".