61996770 has 72 divisors (see below), whose sum is σ = 177208668. Its totient is φ = 15026880.

The previous prime is 61996769. The next prime is 61996771. The reversal of 61996770 is 7769916.

It is an interprime number because it is at equal distance from previous prime (61996769) and next prime (61996771).

It can be written as a sum of positive squares in 2 ways, for example, as 57108249 + 4888521 = 7557^2 + 2211^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (61996771) 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 35 ways as a sum of consecutive naturals, for example, 8044 + ... + 13736.

Almost surely, 2^61996770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61996770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88604334).

61996770 is an abundant number, since it is smaller than the sum of its proper divisors (115211898).

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

61996770 is a wasteful number, since it uses less digits than its factorization.

61996770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5728 (or 5714 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 61996770 is about 7873.8027661353. The cubic root of 61996770 is about 395.7822877358.

The spelling of 61996770 in words is "sixty-one million, nine hundred ninety-six thousand, seven hundred seventy".