61542780 has 48 divisors (see below), whose sum is σ = 185577504. Its totient is φ = 15148800.

The previous prime is 61542751. The next prime is 61542823. The reversal of 61542780 is 8724516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38671 + ... + 40230.

It is an arithmetic number, because the mean of its divisors is an integer number (3866198).

Almost surely, 2^61542780 is an apocalyptic number.

61542780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61542780 is an abundant number, since it is smaller than the sum of its proper divisors (124034724).

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

61542780 is a wasteful number, since it uses less digits than its factorization.

61542780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78926 (or 78924 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 61542780 is about 7844.9206496943. The cubic root of 61542780 is about 394.8138416715.

The spelling of 61542780 in words is "sixty-one million, five hundred forty-two thousand, seven hundred eighty".