61816990 has 8 divisors (see below), whose sum is σ = 111270600. Its totient is φ = 24726792.

The previous prime is 61816969. The next prime is 61817011. The reversal of 61816990 is 9961816.

It is an interprime number because it is at equal distance from previous prime (61816969) and next prime (61817011).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3090840 + ... + 3090859.

It is an arithmetic number, because the mean of its divisors is an integer number (13908825).

Almost surely, 2^61816990 is an apocalyptic number.

61816990 is a deficient number, since it is larger than the sum of its proper divisors (49453610).

61816990 is a wasteful number, since it uses less digits than its factorization.

61816990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6181706.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 61816990 is about 7862.3781389602. The cubic root of 61816990 is about 395.3993504280.

The spelling of 61816990 in words is "sixty-one million, eight hundred sixteen thousand, nine hundred ninety".