61988157 has 24 divisors (see below), whose sum is σ = 111633600. Its totient is φ = 32201280.

The previous prime is 61988131. The next prime is 61988161. The reversal of 61988157 is 75188916.

It is not a de Polignac number, because 61988157 - 2⁶ = 61988093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61988177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44032 + ... + 45417.

It is an arithmetic number, because the mean of its divisors is an integer number (4651400).

Almost surely, 2^61988157 is an apocalyptic number.

It is an amenable number.

61988157 is a deficient number, since it is larger than the sum of its proper divisors (49645443).

61988157 is a wasteful number, since it uses less digits than its factorization.

61988157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89473 (or 89470 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 61988157 is about 7873.2558068438. The cubic root of 61988157 is about 395.7639586588.

The spelling of 61988157 in words is "sixty-one million, nine hundred eighty-eight thousand, one hundred fifty-seven".