61890768 has 30 divisors (see below), whose sum is σ = 173208594. Its totient is φ = 20630208.

The previous prime is 61890757. The next prime is 61890779. The reversal of 61890768 is 86709816.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61890757) and next prime (61890779).

It can be written as a sum of positive squares in only one way, i.e., 35141184 + 26749584 = 5928^2 + 5172^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214755 + ... + 215042.

Almost surely, 2^61890768 is an apocalyptic number.

It is an amenable number.

61890768 is an abundant number, since it is smaller than the sum of its proper divisors (111317826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61890768 is a wasteful number, since it uses less digits than its factorization.

61890768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429811 (or 429802 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 61890768 is about 7867.0685773037. The cubic root of 61890768 is about 395.5565897002.

The spelling of 61890768 in words is "sixty-one million, eight hundred ninety thousand, seven hundred sixty-eight".