61251980 has 24 divisors (see below), whose sum is σ = 129455088. Its totient is φ = 24343488.

The previous prime is 61251979. The next prime is 61251997. The reversal of 61251980 is 8915216.

61251980 = T₄₆₁ + T₄₆₂ + ... + T₇₇₄.

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, 6614 + ... + 12893.

It is an arithmetic number, because the mean of its divisors is an integer number (5393962).

Almost surely, 2^61251980 is an apocalyptic number.

It is an amenable number.

61251980 is an abundant number, since it is smaller than the sum of its proper divisors (68203108).

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

61251980 is a wasteful number, since it uses less digits than its factorization.

61251980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19673 (or 19671 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 61251980 is about 7826.3644177868. The cubic root of 61251980 is about 394.1910056729.

The spelling of 61251980 in words is "sixty-one million, two hundred fifty-one thousand, nine hundred eighty".