61501544 has 24 divisors (see below), whose sum is σ = 124347510. Its totient is φ = 28348416.

The previous prime is 61501543. The next prime is 61501607. The reversal of 61501544 is 44510516.

It can be written as a sum of positive squares in 3 ways, for example, as 36120100 + 25381444 = 6010^2 + 5038^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (61501543) 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, 79592 + ... + 80360.

Almost surely, 2^61501544 is an apocalyptic number.

It is an amenable number.

61501544 is an abundant number, since it is smaller than the sum of its proper divisors (62845966).

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

61501544 is an equidigital number, since it uses as much as digits as its factorization.

61501544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 61501544 is about 7842.2920119057. The cubic root of 61501544 is about 394.7256418798.

Multiplying 61501544 by its sum of digits (26), we get a square (1599040144 = 39988²).

61501544 divided by its sum of digits (26) gives a square (2365444 = 1538²).

The spelling of 61501544 in words is "sixty-one million, five hundred one thousand, five hundred forty-four".