61499640 has 32 divisors (see below), whose sum is σ = 184499280. Its totient is φ = 16399872.

The previous prime is 61499639. The next prime is 61499671. The reversal of 61499640 is 4699416.

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, 256129 + ... + 256368.

Almost surely, 2^61499640 is an apocalyptic number.

61499640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61499640 is an abundant number, since it is smaller than the sum of its proper divisors (122999640).

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

61499640 is a wasteful number, since it uses less digits than its factorization.

61499640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512511 (or 512507 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 61499640 is about 7842.1706178838. The cubic root of 61499640 is about 394.7215684570.

The spelling of 61499640 in words is "sixty-one million, four hundred ninety-nine thousand, six hundred forty".