61909993428 has 24 divisors (see below), whose sum is σ = 144463505760. Its totient is φ = 20635685280.

The previous prime is 61909993421. The next prime is 61909993463. The reversal of 61909993428 is 82439990916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61909993421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168738 + ... + 390246.

It is an arithmetic number, because the mean of its divisors is an integer number (6019312740).

Almost surely, 2^61909993428 is an apocalyptic number.

It is an amenable number.

61909993428 is an abundant number, since it is smaller than the sum of its proper divisors (82553512332).

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

61909993428 is a wasteful number, since it uses less digits than its factorization.

61909993428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244807 (or 244805 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 60.

The spelling of 61909993428 in words is "sixty-one billion, nine hundred nine million, nine hundred ninety-three thousand, four hundred twenty-eight".