61797990 has 16 divisors (see below), whose sum is σ = 148315248. Its totient is φ = 16479456.

The previous prime is 61797979. The next prime is 61798001. The reversal of 61797990 is 9979716.

It is an interprime number because it is at equal distance from previous prime (61797979) and next prime (61798001).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1029937 + ... + 1029996.

It is an arithmetic number, because the mean of its divisors is an integer number (9269703).

Almost surely, 2^61797990 is an apocalyptic number.

61797990 is an abundant number, since it is smaller than the sum of its proper divisors (86517258).

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

61797990 is a wasteful number, since it uses less digits than its factorization.

61797990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2059943.

The product of its (nonzero) digits is 214326, while the sum is 48.

The square root of 61797990 is about 7861.1697602838. The cubic root of 61797990 is about 395.3588364449.

The spelling of 61797990 in words is "sixty-one million, seven hundred ninety-seven thousand, nine hundred ninety".