61929240987 has 6 divisors (see below), whose sum is σ = 82572896028. Its totient is φ = 41285873304.

The previous prime is 61929240949. The next prime is 61929241009. The reversal of 61929240987 is 78904292916.

It is not a de Polignac number, because 61929240987 - 2¹⁵ = 61929208219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61929240487) 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, 359193 + ... + 502869.

It is an arithmetic number, because the mean of its divisors is an integer number (13762149338).

Almost surely, 2^61929240987 is an apocalyptic number.

61929240987 is a deficient number, since it is larger than the sum of its proper divisors (20643655041).

61929240987 is an frugal number, since it uses more digits than its factorization.

61929240987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287357 (or 143680 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 57.

The spelling of 61929240987 in words is "sixty-one billion, nine hundred twenty-nine million, two hundred forty thousand, nine hundred eighty-seven".