61213504 has 28 divisors (see below), whose sum is σ = 132514848. Its totient is φ = 27824000.

The previous prime is 61213487. The next prime is 61213531. The reversal of 61213504 is 40531216.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42772 + ... + 44179.

Almost surely, 2^61213504 is an apocalyptic number.

61213504 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61213504 is an abundant number, since it is smaller than the sum of its proper divisors (71301344).

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

61213504 is a wasteful number, since it uses less digits than its factorization.

61213504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86974 (or 86964 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 61213504 is about 7823.9059299048. The cubic root of 61213504 is about 394.1084501377.

The spelling of 61213504 in words is "sixty-one million, two hundred thirteen thousand, five hundred four".