61997788 has 24 divisors (see below), whose sum is σ = 113627808. Its totient is φ = 29542656.

The previous prime is 61997711. The next prime is 61997797. The reversal of 61997788 is 88779916.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27720 + ... + 29872.

It is an arithmetic number, because the mean of its divisors is an integer number (4734492).

Almost surely, 2^61997788 is an apocalyptic number.

It is an amenable number.

61997788 is a deficient number, since it is larger than the sum of its proper divisors (51630020).

61997788 is a wasteful number, since it uses less digits than its factorization.

61997788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2493 (or 2491 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 55.

The square root of 61997788 is about 7873.8674106185. The cubic root of 61997788 is about 395.7844540001.

The spelling of 61997788 in words is "sixty-one million, nine hundred ninety-seven thousand, seven hundred eighty-eight".