61029940 has 24 divisors (see below), whose sum is σ = 128430792. Its totient is φ = 24360960.

The previous prime is 61029937. The next prime is 61029961. The reversal of 61029940 is 4992016.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13337104 + 47692836 = 3652^2 + 6906^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7492 + ... + 13348.

It is an arithmetic number, because the mean of its divisors is an integer number (5351283).

Almost surely, 2^61029940 is an apocalyptic number.

It is an amenable number.

61029940 is an abundant number, since it is smaller than the sum of its proper divisors (67400852).

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

61029940 is a wasteful number, since it uses less digits than its factorization.

61029940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6387 (or 6385 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 61029940 is about 7812.1661528669. The cubic root of 61029940 is about 393.7141114515.

The spelling of 61029940 in words is "sixty-one million, twenty-nine thousand, nine hundred forty".