61321964 has 12 divisors (see below), whose sum is σ = 117069288. Its totient is φ = 27873600.

The previous prime is 61321961. The next prime is 61321969. The reversal of 61321964 is 46912316.

It is a self number, because there is not a number n which added to its sum of digits gives 61321964.

It is not an unprimeable number, because it can be changed into a prime (61321961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696797 + ... + 696884.

It is an arithmetic number, because the mean of its divisors is an integer number (9755774).

Almost surely, 2^61321964 is an apocalyptic number.

It is an amenable number.

61321964 is a deficient number, since it is larger than the sum of its proper divisors (55747324).

61321964 is a wasteful number, since it uses less digits than its factorization.

61321964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393696 (or 1393694 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 61321964 is about 7830.8341828952. The cubic root of 61321964 is about 394.3410773571.

The spelling of 61321964 in words is "sixty-one million, three hundred twenty-one thousand, nine hundred sixty-four".