61719012 has 18 divisors (see below), whose sum is σ = 156012038. Its totient is φ = 20572992.

The previous prime is 61719001. The next prime is 61719017. The reversal of 61719012 is 21091716.

It can be written as a sum of positive squares in only one way, i.e., 51065316 + 10653696 = 7146^2 + 3264^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×61719012² = 7618472884512288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61719017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 857173 + ... + 857244.

Almost surely, 2^61719012 is an apocalyptic number.

It is an amenable number.

61719012 is an abundant number, since it is smaller than the sum of its proper divisors (94293026).

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

61719012 is a wasteful number, since it uses less digits than its factorization.

61719012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714427 (or 1714422 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 61719012 is about 7856.1448560983. The cubic root of 61719012 is about 395.1903414212.

The spelling of 61719012 in words is "sixty-one million, seven hundred nineteen thousand, twelve".