61990769 has 8 divisors (see below), whose sum is σ = 63383040. Its totient is φ = 60610000.

The previous prime is 61990763. The next prime is 61990801. The reversal of 61990769 is 96709916.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61990769 is a prime.

It is a super-2 number, since 2×61990769² = 7685710882422722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61990763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8519 + ... + 14019.

It is an arithmetic number, because the mean of its divisors is an integer number (7922880).

Almost surely, 2^61990769 is an apocalyptic number.

It is an amenable number.

61990769 is a deficient number, since it is larger than the sum of its proper divisors (1392271).

61990769 is a wasteful number, since it uses less digits than its factorization.

61990769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5751.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 61990769 is about 7873.4216831058. The cubic root of 61990769 is about 395.7695173601.

The spelling of 61990769 in words is "sixty-one million, nine hundred ninety thousand, seven hundred sixty-nine".