61390769 has 4 divisors (see below), whose sum is σ = 66971760. Its totient is φ = 55809780.

The previous prime is 61390759. The next prime is 61390783. The reversal of 61390769 is 96709316.

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.

It is a cyclic number.

It is not a de Polignac number, because 61390769 - 2²⁰ = 60342193 is a prime.

It is a super-2 number, since 2×61390769² = 7537653036822722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61390759) 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, 2790479 + ... + 2790500.

It is an arithmetic number, because the mean of its divisors is an integer number (16742940).

Almost surely, 2^61390769 is an apocalyptic number.

It is an amenable number.

61390769 is a deficient number, since it is larger than the sum of its proper divisors (5580991).

61390769 is a wasteful number, since it uses less digits than its factorization.

61390769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5580990.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 61390769 is about 7835.2261613817. The cubic root of 61390769 is about 394.4885095576.

The spelling of 61390769 in words is "sixty-one million, three hundred ninety thousand, seven hundred sixty-nine".