70778569 has 9 divisors (see below), whose sum is σ = 72722797. Its totient is φ = 68885644.

The previous prime is 70778563. The next prime is 70778621. The reversal of 70778569 is 96587707.

The square root of 70778569 is 8413.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 70778569 - 2¹³ = 70770377 is a prime.

It is a super-2 number, since 2×70778569² = 10019211659375522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70778563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 395322 + ... + 395500.

Almost surely, 2^70778569 is an apocalyptic number.

70778569 is the 8413-rd square number.

70778569 is the 4207-th centered octagonal number.

It is an amenable number.

70778569 is a deficient number, since it is larger than the sum of its proper divisors (1944228).

70778569 is an frugal number, since it uses more digits than its factorization.

70778569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 49.

The cubic root of 70778569 is about 413.6508546284.

Multiplying 70778569 by its sum of digits (49), we get a square (3468149881 = 58891²).

The spelling of 70778569 in words is "seventy million, seven hundred seventy-eight thousand, five hundred sixty-nine".