70778651 has 4 divisors (see below), whose sum is σ = 70827552. Its totient is φ = 70729752.

The previous prime is 70778627. The next prime is 70778657. The reversal of 70778651 is 15687707.

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 70778651 - 2¹⁴ = 70762267 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70778599 and 70778608.

It is not an unprimeable number, because it can be changed into a prime (70778657) 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, 22211 + ... + 25196.

It is an arithmetic number, because the mean of its divisors is an integer number (17706888).

Almost surely, 2^70778651 is an apocalyptic number.

70778651 is a deficient number, since it is larger than the sum of its proper divisors (48901).

70778651 is a wasteful number, since it uses less digits than its factorization.

70778651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48900.

The product of its (nonzero) digits is 82320, while the sum is 41.

The square root of 70778651 is about 8413.0048734088. The cubic root of 70778651 is about 413.6510143724.

The spelling of 70778651 in words is "seventy million, seven hundred seventy-eight thousand, six hundred fifty-one".