70820749 has 4 divisors (see below), whose sum is σ = 73899936. Its totient is φ = 67741564.

The previous prime is 70820747. The next prime is 70820791. The reversal of 70820749 is 94702807.

It is a happy number.

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: 94702807 = 5477 ⋅17291.

It is a cyclic number.

It is not a de Polignac number, because 70820749 - 2¹ = 70820747 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 (70820747) 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, 1539559 + ... + 1539604.

It is an arithmetic number, because the mean of its divisors is an integer number (18474984).

Almost surely, 2^70820749 is an apocalyptic number.

It is an amenable number.

70820749 is a deficient number, since it is larger than the sum of its proper divisors (3079187).

70820749 is a wasteful number, since it uses less digits than its factorization.

70820749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3079186.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 70820749 is about 8415.5064612892. The cubic root of 70820749 is about 413.7330091020.

The spelling of 70820749 in words is "seventy million, eight hundred twenty thousand, seven hundred forty-nine".