70815761 has 4 divisors (see below), whose sum is σ = 74981412. Its totient is φ = 66650112.

The previous prime is 70815739. The next prime is 70815763. The reversal of 70815761 is 16751807.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16751807 = 83 ⋅201829.

It can be written as a sum of positive squares in 2 ways, for example, as 60155536 + 10660225 = 7756^2 + 3265^2 .

It is a cyclic number.

It is not a de Polignac number, because 70815761 - 2⁶ = 70815697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70815763) 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, 2082800 + ... + 2082833.

It is an arithmetic number, because the mean of its divisors is an integer number (18745353).

Almost surely, 2^70815761 is an apocalyptic number.

It is an amenable number.

70815761 is a deficient number, since it is larger than the sum of its proper divisors (4165651).

70815761 is a wasteful number, since it uses less digits than its factorization.

70815761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4165650.

The product of its (nonzero) digits is 11760, while the sum is 35.

The square root of 70815761 is about 8415.2100983873. The cubic root of 70815761 is about 413.7232956177.

The spelling of 70815761 in words is "seventy million, eight hundred fifteen thousand, seven hundred sixty-one".