61451490 has 32 divisors (see below), whose sum is σ = 148654080. Its totient is φ = 16258032.

The previous prime is 61451479. The next prime is 61451519. The reversal of 61451490 is 9415416.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 483807 + ... + 483933.

It is an arithmetic number, because the mean of its divisors is an integer number (4645440).

Almost surely, 2^61451490 is an apocalyptic number.

61451490 is an abundant number, since it is smaller than the sum of its proper divisors (87202590).

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

61451490 is an frugal number, since it uses more digits than its factorization.

61451490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 61451490 is about 7839.1000759016. The cubic root of 61451490 is about 394.6185282561.

61451490 divided by its sum of digits (30) gives a cube (2048383 = 127³).

The spelling of 61451490 in words is "sixty-one million, four hundred fifty-one thousand, four hundred ninety".