70778263 has 4 divisors (see below), whose sum is σ = 70824888. Its totient is φ = 70731640.

The previous prime is 70778261. The next prime is 70778273. The reversal of 70778263 is 36287707.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 70778263 - 2¹ = 70778261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70778261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20956 + ... + 24097.

It is an arithmetic number, because the mean of its divisors is an integer number (17706222).

Almost surely, 2^70778263 is an apocalyptic number.

70778263 is a deficient number, since it is larger than the sum of its proper divisors (46625).

70778263 is a wasteful number, since it uses less digits than its factorization.

70778263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46624.

The product of its (nonzero) digits is 98784, while the sum is 40.

The square root of 70778263 is about 8412.9818138398. The cubic root of 70778263 is about 413.6502585094.

The spelling of 70778263 in words is "seventy million, seven hundred seventy-eight thousand, two hundred sixty-three".