61691258 has 24 divisors (see below), whose sum is σ = 96196800. Its totient is φ = 29665584.

The previous prime is 61691251. The next prime is 61691263. The reversal of 61691258 is 85219616.

It is a super-2 number, since 2×61691258² = 7611622627245128, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61691251) 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, 443753 + ... + 443891.

It is an arithmetic number, because the mean of its divisors is an integer number (4008200).

Almost surely, 2^61691258 is an apocalyptic number.

61691258 is a deficient number, since it is larger than the sum of its proper divisors (34505542).

61691258 is a wasteful number, since it uses less digits than its factorization.

61691258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 273 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The square root of 61691258 is about 7854.3782694749. The cubic root of 61691258 is about 395.1310957266.

The spelling of 61691258 in words is "sixty-one million, six hundred ninety-one thousand, two hundred fifty-eight".