70640761 has 4 divisors (see below), whose sum is σ = 70689024. Its totient is φ = 70592500.

The previous prime is 70640753. The next prime is 70640767. The reversal of 70640761 is 16704607.

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: 16704607 = 281 ⋅59447.

It is a cyclic number.

It is not a de Polignac number, because 70640761 - 2³ = 70640753 is a prime.

It is a super-2 number, since 2×70640761² = 9980234229318242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70640767) 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, 21865 + ... + 24886.

It is an arithmetic number, because the mean of its divisors is an integer number (17672256).

Almost surely, 2^70640761 is an apocalyptic number.

It is an amenable number.

70640761 is a deficient number, since it is larger than the sum of its proper divisors (48263).

70640761 is a wasteful number, since it uses less digits than its factorization.

70640761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48262.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 70640761 is about 8404.8058276203. The cubic root of 70640761 is about 413.3822166575.

The spelling of 70640761 in words is "seventy million, six hundred forty thousand, seven hundred sixty-one".