61378789 has 8 divisors (see below), whose sum is σ = 67815360. Its totient is φ = 55256256.

The previous prime is 61378777. The next prime is 61378799. The reversal of 61378789 is 98787316.

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

It is not a de Polignac number, because 61378789 - 2⁷ = 61378661 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 (61378769) 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, 78099 + ... + 78880.

It is an arithmetic number, because the mean of its divisors is an integer number (8476920).

Almost surely, 2^61378789 is an apocalyptic number.

It is an amenable number.

61378789 is a deficient number, since it is larger than the sum of its proper divisors (6436571).

61378789 is a wasteful number, since it uses less digits than its factorization.

61378789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157019.

The product of its digits is 508032, while the sum is 49.

The square root of 61378789 is about 7834.4616279614. The cubic root of 61378789 is about 394.4628472859.

The spelling of 61378789 in words is "sixty-one million, three hundred seventy-eight thousand, seven hundred eighty-nine".