61897788 has 36 divisors (see below), whose sum is σ = 157935960. Its totient is φ = 20438496.

The previous prime is 61897777. The next prime is 61897789. The reversal of 61897788 is 88779816.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61897789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4183 + ... + 11886.

It is an arithmetic number, because the mean of its divisors is an integer number (4387110).

Almost surely, 2^61897788 is an apocalyptic number.

It is an amenable number.

61897788 is an abundant number, since it is smaller than the sum of its proper divisors (96038172).

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

61897788 is a wasteful number, since it uses less digits than its factorization.

61897788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16186 (or 16181 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 61897788 is about 7867.5147282989. The cubic root of 61897788 is about 395.5715445547.

The spelling of 61897788 in words is "sixty-one million, eight hundred ninety-seven thousand, seven hundred eighty-eight".