61249780 has 24 divisors (see below), whose sum is σ = 128798208. Its totient is φ = 24466848.

The previous prime is 61249751. The next prime is 61249781. The reversal of 61249780 is 8794216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61249781) 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, 17757 + ... + 20923.

It is an arithmetic number, because the mean of its divisors is an integer number (5366592).

Almost surely, 2^61249780 is an apocalyptic number.

It is an amenable number.

61249780 is an abundant number, since it is smaller than the sum of its proper divisors (67548428).

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

61249780 is a wasteful number, since it uses less digits than its factorization.

61249780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4143 (or 4141 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 61249780 is about 7826.2238659522. The cubic root of 61249780 is about 394.1862862032.

The spelling of 61249780 in words is "sixty-one million, two hundred forty-nine thousand, seven hundred eighty".