61690518 has 96 divisors (see below), whose sum is σ = 150307200. Its totient is φ = 18741888.

The previous prime is 61690487. The next prime is 61690523. The reversal of 61690518 is 81509616.

It is a super-2 number, since 2×61690518² = 7611440022216648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 920721 + ... + 920787.

It is an arithmetic number, because the mean of its divisors is an integer number (1565700).

Almost surely, 2^61690518 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61690518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75153600).

61690518 is an abundant number, since it is smaller than the sum of its proper divisors (88616682).

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

61690518 is a wasteful number, since it uses less digits than its factorization.

61690518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 61690518 is about 7854.3311618495. The cubic root of 61690518 is about 395.1295158259.

The spelling of 61690518 in words is "sixty-one million, six hundred ninety thousand, five hundred eighteen".