70775821 has 4 divisors (see below), whose sum is σ = 73058944. Its totient is φ = 68492700.

The previous prime is 70775813. The next prime is 70775833. The reversal of 70775821 is 12857707.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12857707 = 211 ⋅60937.

It is a cyclic number.

It is not a de Polignac number, because 70775821 - 2³ = 70775813 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 (70775891) 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, 1141515 + ... + 1141576.

It is an arithmetic number, because the mean of its divisors is an integer number (18264736).

Almost surely, 2^70775821 is an apocalyptic number.

It is an amenable number.

70775821 is a deficient number, since it is larger than the sum of its proper divisors (2283123).

70775821 is a wasteful number, since it uses less digits than its factorization.

70775821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283122.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 70775821 is about 8412.8366797413. The cubic root of 70775821 is about 413.6455011847.

The spelling of 70775821 in words is "seventy million, seven hundred seventy-five thousand, eight hundred twenty-one".