61961880 has 32 divisors (see below), whose sum is σ = 185886000. Its totient is φ = 16523136.

The previous prime is 61961873. The next prime is 61961897. The reversal of 61961880 is 8816916.

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, 258055 + ... + 258294.

Almost surely, 2^61961880 is an apocalyptic number.

61961880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61961880 is an abundant number, since it is smaller than the sum of its proper divisors (123924120).

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

61961880 is a wasteful number, since it uses less digits than its factorization.

61961880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516363 (or 516359 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 61961880 is about 7871.5868794037. The cubic root of 61961880 is about 395.7080288390.

The spelling of 61961880 in words is "sixty-one million, nine hundred sixty-one thousand, eight hundred eighty".