70778609 has 8 divisors (see below), whose sum is σ = 77280480. Its totient is φ = 64288000.

The previous prime is 70778563. The next prime is 70778621. The reversal of 70778609 is 90687707.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70778609 is a prime.

It is a super-2 number, since 2×70778609² = 10019222983949762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70778609.

It is not an unprimeable number, because it can be changed into a prime (70778689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15602 + ... + 19620.

It is an arithmetic number, because the mean of its divisors is an integer number (9660060).

Almost surely, 2^70778609 is an apocalyptic number.

It is an amenable number.

70778609 is a deficient number, since it is larger than the sum of its proper divisors (6501871).

70778609 is a wasteful number, since it uses less digits than its factorization.

70778609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5631.

The product of its (nonzero) digits is 148176, while the sum is 44.

The square root of 70778609 is about 8413.0023772729. The cubic root of 70778609 is about 413.6509325523.

The spelling of 70778609 in words is "seventy million, seven hundred seventy-eight thousand, six hundred nine".